Diaa TA Youssef , PhD
Professor of Natural Products
Chemistry & Medicinal Chemistry
King Abdulaziz University, Jeddah ·
Current Address:Department of Natural Products and Alternative Medicine,College of Pharmacy,King Abdulaziz University,B.O. Box 80260,Jeddah21589,
Kingdom of Saudi Arabia
Mobile:+966-548535344
E-mail:dyoussef@kau.edu.sa/diaa22@yahoo.com
LINKS
http://pharmacy.scuegypt.edu.eg/attach/Pharmacognosy%20Prof.%20Diaa%20Youssef_CV_Nov_2012.pdf,
http://www.scopus.com/authid/detail.uri?authorId=6701448666
http://pubget.com/author/diaa-t-a-youssef
http://www.scopus.com/authid/detail.uri?authorId=6701448666
http://pubget.com/author/diaa-t-a-youssef
Scopus - Author details -
Youssef, Diaa Tohamy A
Suez Canal University, Department of Pharmacognosy,
Ismalia,
Egypt
Author ID: 6701448666
Research Experience
Publications
Theonellamide G, a potent antifungal and cytotoxic bicyclic glycopeptide from the Red Sea marine sponge Theonella swinhoei
Diaa T A Youssef
Department of Natural Products, Faculty of Pharmacy, King Abdulaziz University, Jeddah 21589, Kingdom of Saudi Arabia
Mar Drugs 12:1911-23. 2014- Diaa T A Youssef
Department of Natural Products, Faculty of Pharmacy, King Abdulaziz University, Jeddah 21589, Kingdom of Saudi Arabia
Mar Drugs 11:1061-70. 2013 2,3-seco-2,3-dioxo-lyngbyatoxin A from a Red Sea strain of the marine cyanobacterium Moorea producens
Diaa T A Youssef
a Department of Natural Products, Faculty of Pharmacy, King Abdulaziz University, Jeddah 21589, Kingdom of Saudi Arabia
Nat Prod Res 29:703-9. 2015- Lamiaa A Shaala
Natural Products Unit, King Fahd Medical Research Center, King Abdulaziz University, Jeddah 21589, Kingdom of Saudi Arabia
Mar Drugs 12:5021-34. 2014 - Lamiaa A Shaala
Natural Products Unit, King Fahd Medical Research Center, King Abdulaziz University, Jeddah 21589, Saudi Arabia
Mar Drugs 13:1621-31. 2015 - Sabrin R M Ibrahim
Department of Pharmacognosy and Pharmaceutical Chemistry, Faculty of Pharmacy, Taibah University, Al Madinah Al Munawarah 30078, Saudi Arabia Department of Pharmacognosy, Faculty of Pharmacy, Assiut University, Assiut 71526, Egypt
Steroids 96:63-72. 2015 - Lamiaa A Shaala
King Fahd Center for Medical Research, King Abdulaziz University, Kingdom of Saudi Arabia
J Nat Prod 74:1517-20. 2011 - Lamiaa A Shaala
Natural Products Unit, King Fahd Medical Research Center, King Abdulaziz University, Jeddah 21589, Kingdom of Saudi Arabia
Mar Drugs 10:2492-508. 2012 - Lamiaa A Shaala
Natural Products Unit, King Fahd Medical Research Center, King Abdulaziz University, Jeddah 21589, Saudi Arabia
Mar Drugs 13:1698-709. 2015 - Gamal A Mohamed
a Department of Natural Products, Faculty of Pharmacy, King Abdulaziz University, Jeddah 21589, Saudi Arabia
Nat Prod Res 28:1082-90. 2014
Detail Information
Publications
- Diaa T A Youssef
Department of Natural Products, Faculty of Pharmacy, King Abdulaziz University, Jeddah 21589, Kingdom of Saudi Arabia
Mar Drugs 12:1911-23. 2014..0 μM. These findings provide further insight into the chemical diversity and biological activities of this class of compounds... - Diaa T A Youssef
Department of Natural Products, Faculty of Pharmacy, King Abdulaziz University, Jeddah 21589, Kingdom of Saudi Arabia
Mar Drugs 11:1061-70. 2013..Hyrtioerectines D-F (1-3) displayed variable antimicrobial, free radical scavenging and cancer growth inhibition activities. Generally, compounds 1 and 3 were more active than compound 2... - Diaa T A Youssef
a Department of Natural Products, Faculty of Pharmacy, King Abdulaziz University, Jeddah 21589, Kingdom of Saudi Arabia
Nat Prod Res 29:703-9. 2015.... - Lamiaa A Shaala
Natural Products Unit, King Fahd Medical Research Center, King Abdulaziz University, Jeddah 21589, Kingdom of Saudi Arabia
Mar Drugs 12:5021-34. 2014..coli and C. albicans. These findings provide further insight into the biosynthetic capabilities of this ascidian and the chemical diversity as well as the biological activity of this class of compounds. .. - Lamiaa A Shaala
Natural Products Unit, King Fahd Medical Research Center, King Abdulaziz University, Jeddah 21589, Saudi Arabia
Mar Drugs 13:1621-31. 2015..These findings provide further insight into the biosynthetic capabilities of members of the genus Suberea and the chemical diversity as well as the biological activity of these compounds. .. - Sabrin R M Ibrahim
Department of Pharmacognosy and Pharmaceutical Chemistry, Faculty of Pharmacy, Taibah University, Al Madinah Al Munawarah 30078, Saudi Arabia Department of Pharmacognosy, Faculty of Pharmacy, Assiut University, Assiut 71526, Egypt
Steroids 96:63-72. 2015..5 to 0.7μM against U373 glioblastoma (GBM) and PC-3 prostate cancer cell lines. These results provide further insight into the chemical diversity and biological activities of this class of compounds. .. - Lamiaa A Shaala
King Fahd Center for Medical Research, King Abdulaziz University, Kingdom of Saudi Arabia
J Nat Prod 74:1517-20. 2011..Using the DPPH TLC autographic rapid screen for free radical scavenging effects, subereaphenol D displayed a significant antioxidant effect. In addition, the cytotoxic activities of the isolated compounds were investigated... - Lamiaa A Shaala
Natural Products Unit, King Fahd Medical Research Center, King Abdulaziz University, Jeddah 21589, Kingdom of Saudi Arabia
Mar Drugs 10:2492-508. 2012..Subereamolline A and related brominated alkaloids are novel scaffolds appropriate for further future use for the control of metastatic breast cancer... - Lamiaa A Shaala
Natural Products Unit, King Fahd Medical Research Center, King Abdulaziz University, Jeddah 21589, Saudi Arabia
Mar Drugs 13:1698-709. 2015..Compounds 2 and 6 showed significant antimigratory activity against MDA-MB-231, as well as antifungal activity against C. albicans. .. - Gamal A Mohamed
a Department of Natural Products, Faculty of Pharmacy, King Abdulaziz University, Jeddah 21589, Saudi Arabia
Nat Prod Res 28:1082-90. 2014..Furthermore, compounds 1 and 2 displayed weak activity against A549 non-small cell lung cancer, the U373 glioblastoma and the PC-3 prostate cancer cell lines. .. - Dina R Abou-Hussein
a Department of Natural Products and Alternative Medicine, Faculty of Pharmacy, King Abdulaziz University, Jeddah 21589, Saudi Arabia
Nat Prod Res 28:1134-41. 2014..Biological testing revealed that the chloroform fraction possesses significant anti-inflammatory activity in the carrageenan-induced hind paw oedema in rats...
Terretrione D
.Terretrione D
Key COSY and HMBC correlations of 2.
Figure 1.
Structures of Compounds 1–6.
methyl-2-([2-(1H-indol-3-yl)ethyl]carbamoyl)acetate (1),
Terretrione D (2)
tryptamine (3),
indole-3-carbaldehyde (4),
3,6-diisobutylpyrazin-2(1H)-one (5) and
terretrione C (6),
| Position | δC, Type a | δH, m (J in Hz) | HMBC | NOESY |
|---|---|---|---|---|
| 2 | 173.0, C b | |||
| 3 | 60.1, CH | 4.18, d (4.8) | C-2, C-5, C-1′ | H-6, H3-8, H-1′ |
| 5 | 173.2, C | |||
| 6 | 56.4, CH | 4.68, dd (8.4, 6.6) | C-5, C-7, C-1″ | H-3, H3-8, H2-1″ |
| 7 | 173.1, C b | |||
| 8 | 22.9, CH3 | 1.90, s | C-2, C-7 | |
| 1′ | 32.2, CH | 2.07, m | C-2, C-3, C-2′, C-3′ | H-3 |
| 2′ | 19.8, CH3 | 0.81, d (7.2) | C-1′, C-3 | |
| 3′ | 18.2, CH3 | 0.78, d (7.2) | C-1′, C-3 | |
| 1″ | 39.0, CH2 | 3.11, dd (13.8, 6.6) 2.88, dd (13.8, 8.4) | C-2″, C-3″, C-6, C-7 | H-6 |
| 2″ | 138.6, C | |||
| 3″ | 130.2, CH | 7.23, m | C-2″, C-5″ | |
| 4″ | 129.4, CH | 7.24, m | C-2″ | |
| 5″ | 127.7, CH | 7.14, m | C-3″, C-7″ | |
| 6″ | 129.4, CH | 7.24, m | C-2″ | |
| 7″ | 130.2, CH | 7.23, m | C-1″, C-5″ |
a Multiplicities were deduced by DEPT and HSQC; b signals may be interchangeable.
compound 2 (Figure 1) showed a molecular formula C16H20N2O3, as deduced from the HRESIMS pseudomolecular ion peak at m/z 289.1555 [M + H]+, requiring eight degrees of unsaturation. The 13C NMR spectrum revealed signals for 16 carbons. Careful investigation of the 1H, 13C and 2D NMR spectra supported the presence of a valine residue in 2. This was evident from the NMR signals at δH/δC 0.81 (3H, d, J = 7.2 Hz, H3-2′)/19.8 (C-2′), 0.78 (3H, d, J = 7.2 Hz, H3-3′)/18.2 (C-3′), 2.07 (1H, m, H-1′)/32.2 (C-1′), 4.18 (1H, d, J = 4.8 Hz, H-3)/60.1 (C-3) and δC 173.0 (C-2). In addition, signals for a 2-benzylmalonamide moiety were observed. The signals at δC 138.6 (C-2″), δH/δC 7.23 (2H, m)/130.2 (C-3″,7″), 7.24 (2H, m)/129.4 (C-4″,6″) and 7.14 (1H, m)/127.7 (C-5″) supported the existence of a phenyl group. In addition, the coupled signals at δH 3.11 (1H, dd, J = 13.8, 6.6 Hz, H-1″a) and 2.88 (1H, dd, J = 13.8, 8.4 Hz, H-1″b) showed vicinal coupling to the signal at δH 4.68 (1H, dd, J = 8.4, 6.6 Hz, H-6) in the 1H,1H-COSY spectrum. Furthermore, the two amidic carbonyls (C-5 and C-7) of the 2-benzylmalonamide moiety resonate at δC 173.2 and 173.1. Finally, a three-proton singlet at δH 1.90, which correlates with the 13C signal at δC 22.9, was assigned to a methyl group linked to N-1. The linkage of the valine residue with the 2-benzylmalonamide moiety through N-1 and N-4 was supported by the HMBC correlations of H-3/C-5, H-3/C-2, H3-8/C-2 (δC 173.0) and H3-8/C-7 (δC 173.1). The HMBC correlations of H3-8 to C-2 and C-7 secured the placement of the N-methyl at N-1. Additional HMBC correlations within the valine and the 2-benzylmalonamide moieties (Table 1 and Figure 2) confirmed the assignment of all carbon signals and completing the flat structure of 2. The absolute configuration of the chiral center at C-3 of the valine residue was established by analysis of the degradation product of 2. A small amount of 2 was hydrolyzed with 6N HCl to give valine residue, which was analyzed by chiral HPLC, and its retention time was compared with the retention times of authentic standards (d- and l-valine). The amino acid in 2 was determined as l-valine. In addition, the relative configuration of C-6 was determined as 6S*, since the NOESY spectrum (Table 1) exhibited a strong correlation between H-3 (δH 4.18) and H-6 (δH 4.68). The MM2 ChemBio3D Ultra 14.0 (ChemBioOffice® Ultra 14.0) energy minimized drawing for Compound 2 was also created and supports a significant NOESY correlation between H-3 and H-6 (Figure 3). Therefore, 2 was assigned as (3S,6S)-6-benzyl-3-isopropyl-1-methyl-1,4-diazepane-2,5,7-trione and named terretrione D. Terretrione D possesses the 1,4-diazepane skeleton, which was previously reported in terretriones A–C. These compounds were reported from the marine fungus Aspergillus terreus [18]. It is worth mentioning that terretrione D is 4-demethylterretrione B, and the NMR data of 2 are comparable with those of terretrione B [18]. Compound 2 is reported here for the first time from a natural source, and therefore, it is considered as a new natural product.
The known compounds were identified by extensive study of their spectral data, including HRESIMS, 1D and 2D NMR data, as well as by comparison with the available data in the literature. Thus, the compounds were identified as methyl-2-([2-(1H-indol-3-yl)ethyl]carbamoyl)acetate (1) [16], tryptamine (3), indole-3-carbaldehyde (4), 3,6-diisobutylpyrazin-2(1H)-one (5) [17] and terretrione C (6) [18]. The amino acid residue of compound 6 was also determined as N-methyl-l-isoleucine by HPLC chiral analysis of the hydrolysate of 6 (see Section 3.6). Furthermore, the relative configuration of its C-6 was assigned as 6S* by the NOESY correlation, similar to that described for 2.
Terretrione D (2): White amorphous powder; [α]D −65.7 (c 1.5, MeOH); UV (MeOH) λmax (log ε) 314 (2.65) nm; IR νmax (film) 3367, 1682, 1630, 1540, 1455, 1288, 1094, 702 cm−1; NMR data, see Table 1; HRESIMS m/z 289.1555 (calcd. for C16H21N2O3, [M + H]+, 289.1552).
see
http://www.mdpi.com/1660-3397/13/4/1698
Mar. Drugs 2015, 13(4), 1698-1709; doi:10.3390/md13041698
Article
Identification and Bioactivity of Compounds from the Fungus Penicillium sp. CYE-87 Isolated from a Marine Tunicate
1
Natural Products Unit, King Fahd Medical Research Center, King Abdulaziz University, Jeddah 21589, Saudi Arabia
2
Suez Canal University Hospital, Suez Canal University, Ismailia 51522, Egypt
3
Department of Natural Products, Faculty of Pharmacy, King Abdulaziz University, Jeddah 21589, Saudi Arabia
////////////////////////////////////////////////////Hyrtioerectine D, E, F
Figure 1.
Structures of hyrtioerectines D–F (1–3) isolated from the marine sponge Hyrtios species.
Figure 2.
COSY and HMBC correlations observed for compound 1.
Structure Elucidation of Compounds 1–3
The HRMS of compound 1 established a molecular formula C20H13N3O4 requiring 16 degrees of unsaturation. Compound 1 gave a bluish color on the TLC with FeCl3 indicating its phenolic nature. Its 1H NMR spectrum (in methanol-d4, Table 1) showed resonances for eight aromatic protons ranging from 6.80 to 9.64 ppm, suggesting the absence of any aliphatic moiety in the molecule. The 13C NMR spectrum of 1 (Table 1) displayed resonances for 20 carbons including 8 methines and 12 quaternary carbons. Two of the 13C quaternary resonances were deshielded at δ 154.3 (C-6) and 153.0 (C-6′) suggesting the oxygenation of their corresponding carbons. Interpretation of the 1D (1H and 13C) and 2D (1H–1H COSY, HSQC and HMBC) NMR spectroscopic data supported the presence of two ABX systems for trisubstituted β-carboline (H-5, H-7 and H-8) and disubstituted indole (H-4ʹ, H-5ʹ and H-7ʹ) moieties, respectively. These two moieties include 15 degrees of unsatuartion suggesting the need for an additional degree of unsaturation in 1. Interpretation of the NMR data (1H, COSY and HSQC) supported the 3,4,6-trisubstitution of the β-carboline moiety. This was evident from the resonating signals at δ 8.07 (1H, d, J = 2.0, H-5), 6.80 (1H, dd, J = 8.5, 2.0, H-7), 7.30 (1H, d, J = 8.5, H-8) and 9.64 (s, H-1). Additional signals at δ 8.87 (1H, s, H-2ʹ), 7.57 (1H, d, J = 8.7, H-4ʹ), 7.13 (1H, dd, J = 8.7, 2.3, H-5ʹ) and 7.60 (1H, d, J = 2.3, H-7ʹ) were assigned as 3,6-disubstituted indole moiety. The HSQC experiment allowed the unambiguous assignment of the protonated methine carbons in 1 (Table 1). The quaternary carbons were unambiguously assigned from HMBC data (Table 2 and Figure 2). For example, the location of the OH moieties at C-6 and C-6′ was supported from HMBC correlations of H-5/C-6, H-7/C-6, H-8/C-6 and H-4′/C-6′, H-5′/C-6′ and H-7′/C-6′ (Table 2). The connection of the indole and β-carboline moieties through C-3 and C-3ʹ was supported from a 3JCH HMBC cross peak between H-2ʹ of the indole moiety (δ 8.87) and C-3 of the β-carboline moiety (δ 138.1). Finally, the quaternary carbon resonating at δ 173.0 (C-8′) was assigned as a carboxylic moiety at C-4 completing the degrees of unsaturation in 1. This was supported by an IR band at 1725 cm−1 for the carbonyl moiety of the carboxylic acid. Furthermore, the MS fragment ion at m/z 315.1009 with the molecular formula C19H13N3O2 [M − COOH + H]+ supported the presence of the carboxylic functionality, thus completing the assignment of 1.Compound 2displayed a pseudomolecular ion peak at m/z 374.1138 corresponding to C21H16N3O4 [M + H]+, being 14 mass unit (CH2) more than 1 and requiring 16 degrees of unsaturation. Comparison of the NMR data of 2 with those of 1 showed identical similarity of the 1H and 13C NMR resonances of both compounds (Table 1). Moreover, a new three-proton singlet in 1H NMR at δ 3.84 (H3-9ʹ) correlates in the HSQC with the 13C NMR signal at δ 55.8 (C-9ʹ) suggesting the presence of a methoxyl moiety in 2 at C-6. The assignment of the methoxyl moiety at C-6 was secured from HMBC cross peak of OCH3/C-6 (Table 2). Additionally, the unambiguous assignments of the protonated and quaternary carbons in 2 were secured from HSQC and HMBC experiments, respectively, thus completing the assignment of 2.
Hyrtioerectine D (1): yellow solid; UV (MeOH) λmax (log ε) 387 nm (3.85), 248 nm (3.85), 312 nm (4.05); IR νmax (film) 3600, 3500, 3020, 2980, 1725, 1610, 1405, 1290, 1255, 1220, 890 cm−1; NMR data, see Table 1, Table 2; positive HRESIMS m/z 360.0981 (calcd for C20H14N3O4 [M + H]+, 360.0984).
Hyrtioerectine E (2): yellow solid; UV (MeOH) λmax (log ε) 420 nm (3.90), 252 nm (3.95), 315 nm (4.15); IR νmax (film) 3595, 3545, 3015, 2980, 1720, 1612, 1410, 1290, 1250, 1220, 895 cm−1; NMR data, see Table 1, Table 2; positive HRESIMS m/z 374.1138 (calcd for C21H16N3O4 [M + H]+, 374.1140).
Hyrtioerectine F (3): yellow solid; UV (MeOH) λmax (log ε) 380 nm (3.95), 240 nm (4.10), 315 nm (4.00); IR νmax (film) 3590, 3500, 3350, 3010, 2985, 1655, 1615, 1405, 1290, 1255, 1215, 895 cm−1; NMR data, see Table 1, Table 2; positive HRESIMS m/z 359.1142 (calcd for C20H15N4O3 [M + H]+, 359.1144).
| Hyrtioerectine D | Hyrtioerectine E | Hyrtioerectine F | ||||
|---|---|---|---|---|---|---|
| Position | δC (mult.) a | δH, mult. (J in Hz) | δC (mult.) a | δH, mult. (J in Hz) | δC (mult.) a | δH, mult. (J in Hz) |
| 1 | 140.8 (CH) | 9.64, s | 141.2 (CH) | 9.66, s | 139.6 (CH) | 9.71, s |
| 3 | 138.1 (qC) | 138.2 (qC) | 138.3 (qC) | |||
| 4 | 138.8 (qC) | 138.8 (qC) | 138.8 (qC) | |||
| 4a | 115.9 (qC) | 115.8 (qC) | 115.9 (qC) | |||
| 4b | 130.1 (qC) | 130.3 (qC) | 130.4 (qC) | |||
| 5 | 108.2 (CH) | 8.07, d (2.0) | 110.1 (CH) | 8.10, d (2.2) | 107.2 (CH) | 8.09, d (2.2) |
| 6 | 154.3 (qC) | 156.2 (qC) | 154.2 (qC) | |||
| 7 | 113.5 (CH) | 6.80, dd (8.5, 2.0) | 113.5 (CH) | 6.78, dd (8.5, 2.2) | 113.7 (CH) | 6.76, dd (8.5, 2.2) |
| 8 | 113.1 (CH) | 7.30, d (8.5) | 113.1 (CH) | 7.27, d (8.5) | 113.5 (CH) | 7.32, d (8.5) |
| 8a | 132.1 (qC) | 132.2 (qC) | 132.4 (qC) | |||
| 9a | 133.2 (qC) | 133.1 (qC) | 133.2 (qC) | |||
| 2′ | 119.6 (CH) | 8.87, s | 119.5 (CH) | 8.88, s | 119.6 (CH) | 8.87, s |
| 3′ | 123.2 (qC) | 123.2 (qC) | 123.2 (qC) | |||
| 3a′ | 137.5 (qC) | 137.5 (qC) | 137.5 (qC) | |||
| 4′ | 114.1 (CH) | 7.57, d (8.7) | 114.1 (CH) | 7.61, d (8.7) | 114.1 (CH) | 7.64, d (8.0) |
| 5′ | 119.7 (CH) | 7.13, dd (8.7, 2.3) | 119.6 (CH) | 7.15, dd (8.7, 2.2) | 119.7 (CH) | 7.17, dd (8.7, 2.0) |
| 6′ | 153.0 (qC) | 153.1 (qC) | 153.0 (qC) | |||
| 7′ | 106.7 (CH) | 7.60, d (2.3) | 106.9(CH) | 7.62, d (2.2) | 106.7 (CH) | 7.65, d (2.0) |
| 7a′ | 132.6 (qC) | 132.5 (qC) | 132.6 (qC) | |||
| 8′ | 173.0 (qC) | 173.0 (qC) | 164.2 (qC) | |||
| 9′ | 55.8 (CH3) | 3.84, s | ||||
a multiplicities of the signals were obtained from HSQC experiments; qC = quaternary carbon, CH = methine; CH3 = methyl.
| C# | Hyrtiooerectine D (1) | Hyrtioerectine E (2) | Hyrtioerectine F (3) |
|---|---|---|---|
| HMBC (H→C#) | HMBC (H→C#) | HMBC (H→C#) | |
| 3 | H-1, H-2′ | H-1, H-2′ | H-1, H-2′ |
| 4 | - | - | - |
| 4a | H-1, H-5 | H-1 | H-1, H-5 |
| 4b | H-8 | H-8 | H-8 |
| 5 | H-7 | H-7 | H-7 |
| 6 | H-5, H-7, H-8 | H-5, H-7, H-8, H3-9′ | H-5, H-8 |
| 7 | H-5 | H-5 | H-5 |
| 8 | H-7 | H-7 | H-7 |
| 8a | H-5, H-7 | H-5, H-7 | H-5, H-7 |
| 9a | H-1 | H-1 | H-1 |
| 2′ | - | - | - |
| 3′ | H-2′ | H-2′ | H-2′ |
| 3a′ | H-2′, H-4′, H-5′, H-7′ | H-2′, H-4′, H-7′ | H-2′, H-4′, H-7′ |
| 4′ | H-5′ | H-5′ | H-5′ |
| 5′ | H-4′, H-7′ | H-4′, H-7′ | H-4′, H-7′ |
| 6′ | H-4′, H-5′, H-7′ | H-4′, H-5′, H-7′ | H-4′, H-5′, H-7′ |
| 7′ | H-5′ | H-5′ | H-5′ |
| 7a′ | H-2′, H-4′, H-7′ | H-2′, H-4′, H-7′ | H-2′, H-4′, H-7′ |
see
http://www.mdpi.com/1660-3397/11/4/1061/htm
Mar. Drugs
2013,
11(4),
1061-1070;
doi:10.3390/md11041061
Article
Bioactive Compounds from the Red Sea Marine Sponge Hyrtios Species
1
Department of Natural Products, Faculty of Pharmacy, King Abdulaziz University, Jeddah 21589, Kingdom of Saudi Arabia
2
Natural Products Unit, King Fahd Medical Research Center, King Abdulaziz University, Jeddah 21589, Kingdom of Saudi Arabia
3
Department of Medical Parasitology,
Faculty of Medicine, Princess Al-Jawhara Center of Excellence in
Research of Hereditary Disorders, King Abdulaziz University, Jeddah
21589, Kingdom of Saudi Arabia
*Author to whom correspondence should be addressed; Tel.: +966-548-535-344; Fax: +966-269-516-96.
////////////////////////
18. Callyaerin G, a new cytotoxic cyclic peptide from the marine sponge Callyspongia aerizusa (08-2979EP)
Sabrin R. M. Ibrahim, RuAngelie Edrada-Ebel, Gamal A. Mohamed, Diaa T. A. Youssef, Victor Wray and Peter Proksch
Full Text: PDF (159K)
pp. 164 - 171
received Jan 8 2008; accepted Mar 23 2008; published Apr 16 2008;
////////////////////////////////
Figure 1. Structures of the isolated compounds 1– 5 . - Scientific ...
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18. Callyaerin G, a new cytotoxic cyclic peptide from the marine sponge Callyspongia aerizusa (08-2979EP)
Sabrin R. M. Ibrahim, RuAngelie Edrada-Ebel, Gamal A. Mohamed, Diaa T. A. Youssef, Victor Wray and Peter Proksch
Full Text: PDF (159K)
pp. 164 - 171
////////////////////////////////
Figure 1. Structures of the isolated compounds 1– 5 . - Scientific ...
www.researchgate.net
Figure 1. Structures of the isolated compounds 1– 5 .
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