title: Antimycobacterial scalarane-based sesterterpenes from the Red Sea sponge Hyrtios erecta.
abstract: A new scalarane-type pentacyclic sesterterpene, sesterstatin 7 (1), was isolated from the Red Sea sponge Hyrtios erecta, together with 16-epi-scalarolbutenolide (2), 25-dehydroxy-12-epi-deacetylscalarin (3), 3-acetylsesterstatin 1 (4), and 21-acetoxydeoxyscalarin. The structure of 1 was elucidated by spectroscopic data interpretation. Sesterstatin 7 (1) showed 63% inhibition of Mycobacterium tuberculosis (H(37)Rv) at a concentration of 6.25 microg/mL. Compound 2 displayed moderate inhibitory activity, while 3 and 4 were weakly active against the same biological target.
authors.affiliation: Department of Pharmacognosy and Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Suez Canal University, Ismailia 41522, Egypt.
authors.forename: Diaa T A
authors.initials: DT
authors.lastname: Youssef
authors.forename: Lamiaa A
authors.initials: LA
authors.lastname: Shaala
authors.forename: Samy
authors.initials: S
authors.lastname: Emara
mesh_terms: D000818:Animals; D000995:Antitubercular Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D019156:Indian Ocean; D008826:Microbial Sensitivity Tests; D015394:Molecular Structure; D009169:Mycobacterium tuberculosis / Q000187:drug effects*; D011161:Porifera / Q000737:chemistry*; D054830:Sesterterpenes; D013729:Terpenes / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology
chemical_list: D000995:Antitubercular Agents; D054830:Sesterterpenes; D013729:Terpenes; C506990:sesterstatin 7