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( Weri Hong Wang ),( Ye Hee Lee ),( Tae Gu Lee ),( Bo Ra Mun ),( Awadut G Girl ),( Ji Hye Lee ),( Hi Young Kim ),( Dong Yup Hahn ),( In Ho Yang ),( Jung Wook Chin ),( Hyuk Jae Choi ),( Sang Jip Nam ) 영남대학교 약품개발연구소 2012 영남대학교 약품개발연구소 연구업적집 Vol.22 No.0
A chemical investigation of a Korean marine sponge, Phorbas sp., yielded unprecedented sesterterpenoids phorone A (1) andisophorbasone A (2) along with ansellone B (3) and phorbasone A acetate (4). Their complete structures were elucidated by the combination of spectroscopic data and chemical manipulation. Phorone A (1) and isophorbasone A (2) have the new "phorane"(5) and "isophorbasane"(6) sesterterpenoid carbon skeletons, respectively. Ansellone B (3) and phorbasone A acetate (4) exhibited potent inhibitory activity on nitric oxide production in RAW 264.7 LPS-activated mouse macrophage cells with IC(50) values of 4.5 and 2.8 μM, respectively.