title: Further study on Penares sp. from Vietnamese waters: minor lanostane and nor-lanostane triterpenes.
abstract: Eight new oxidized lanostane and nor-lanostane derivatives (1-8) along with the previously known penasterol (9) and 24-ethylcholesta-4,24(28)-dien-3-one (10) were isolated from a sponge Penares sp. collected from the Vietnamese waters. Structures of these minor compounds were elucidated by the detailed NMR spectroscopic and mass-spectrometric analyses and by comparison with earlier reported spectroscopic data. A hypothetic scheme of metabolism of the lanostane derivatives in sponges belonging to Penares and Erylus genera was proposed and discussed.
authors: G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far East Branch of the Russian Academy of Sciences, Pr. 100-let Vladivostoku 159, 690022 Vladivostok, Russia.
authors: Ekaterina G
authors: EG
authors: Lyakhova
authors: G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far East Branch of the Russian Academy of Sciences, Pr. 100-let Vladivostoku 159, 690022 Vladivostok, Russia.
authors: Sophia A
authors: SA
authors: Kolesnikova
authors: G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far East Branch of the Russian Academy of Sciences, Pr. 100-let Vladivostoku 159, 690022 Vladivostok, Russia.
authors: Anatoly I
authors: AI
authors: Kalinovsky
authors: G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far East Branch of the Russian Academy of Sciences, Pr. 100-let Vladivostoku 159, 690022 Vladivostok, Russia.
authors: Pavel S
authors: PS
authors: Dmitrenok
authors: Institute of Marine Biochemistry, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Caugiay, Hanoi, Viet Nam.
authors: Nguyen H
authors: NH
authors: Nam
authors: G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far East Branch of the Russian Academy of Sciences, Pr. 100-let Vladivostoku 159, 690022 Vladivostok, Russia. Electronic address: stonik@piboc.dvo.ru.
authors: Valentin A
authors: VA
authors: Stonik
mesh_terms: D000818:Animals; D000431:Ethanol / Q000737:chemistry; D011161:Porifera / Q000737:chemistry*; D014315:Triterpenes / Q000737:chemistry* / Q000302:isolation & purification*; D014744:Vietnam; D014867:Water
chemical_list: D014315:Triterpenes; D014867:Water; D000431:Ethanol
keywords: Biochemical parallelism; Dimethylsteroids; Marine sponge; Penares; Trimethylsteroids; Triterpenoids