title: A Norsesterterpene Peroxide from a Marine Sponge Hippospongia sp.
abstract: One new norsesterterpene peroxide, rhopaloic acid H (1), along with two known related metabolites 2 and 3, were isolated from a marine sponge Hippospongia sp. The structures of compounds were elucidated by means of IR, MS, and NMR techniques and comparison of the NMR data with those of known analogues. Evaluation of the cytotoxicities revealed that compound 2 exhibited significant cytotoxicity against DLD-1, Molt 4, T47D and K-562 cell lines, with IC50 values of 3.18, 0.69, 2.22 and 1.06 µg/mL, respectively. Moreover, compound 3 also showed significant K562 inhibitory activity, with IC50 value of 3.65 µg/mL.
authors.forename: Ching-chyuan
authors.initials: CC
authors.lastname: Su
authors.forename: Huey-jen
authors.initials: HJ
authors.lastname: Su
authors.forename: Kai-ju
authors.initials: KJ
authors.lastname: Liang
authors.forename: Su-june
authors.initials: SJ
authors.lastname: Tsaif
authors.forename: Jui-hsin
authors.initials: JH
authors.lastname: Su
mesh_terms: D000818:Animals; D045744:Cell Line, Tumor; D004354:Drug Screening Assays, Antitumor; D006801:Humans; D008386:Marine Biology; D010545:Peroxides / Q000737:chemistry / Q000302:isolation & purification*; D011161:Porifera / Q000737:chemistry*; D054830:Sesterterpenes / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D010545:Peroxides; D054830:Sesterterpenes; C000611009:rhopaloic acid H