| kolokosides a-d: triterpenoid glycosides from a hawaiian isolate of xylaria sp. | four new triterpenoid glycosides, kolokosides a-d (1-4), along with the known compound 19,20-epoxycytochalasin n, were isolated from cultures of a hawaiian wood-decay fungus (xylaria sp.). the structures and relative configurations of 1-4 were determined primarily by analysis of nmr data, and the absolute configuration of 1 was assigned by application of the exciton chirality method. compound 1 exhibited activity against gram-positive bacteria. | 2007 | 17284074 |
| cytotoxic, radical scavenging and antimicrobial activities of sesquiterpenoids from the tahitian liverwort mastigophora diclados (brid.) nees (mastigophoraceae). | a drimane, (+)-drimenol (1), five known herbertanes, (-)-alpha-herbertenol (2), (-)-herbertenediol (3), mastigophorene a (4), (-)-mastigophorene c (5) and (-)-mastigophorene d (6), a pimarane, (-)-ent-pimara-8(14),15-dien-19-oic acid (7), and two eudesmanolides, (-)-diplophyllolide a (8) and (-)-diplophyllin (9) were isolated from the tahitian mastigophora diclados (brid.) nees. herbertane sesquiterpenes (2, 3, 5 and 6) showed cytotoxicity against hl-60 and kb cell lines, radical scavenging acti ... | 2010 | 20458547 |
| phomalevones a-c: dimeric and pseudodimeric polyketides from a fungicolous hawaiian isolate of phoma sp. (cucurbitariaceae). | phomalevones a-c (1-3), three new com-pounds with bis-dihydroxanthone and bis-benzophenone systems, were isolated from cultures of a hawaiian isolate of phoma sp. (myc-1734 = nrrl 39060; cucurbitariaceae). the structures of 1-3 were determined by analysis of nmr and ms data. the absolute configurations of the sp(3) stereocenters in the monomeric unit of 1 were assigned by application of mosher's method, and overall absolute configurations were proposed on the basis of ecd data using both computa ... | 2011 | 21247198 |
| hymenopsins a and b and a macrophorin analogue from a fungicolous hymenopsis sp. | hymenopsin a (1), hymenopsin b (2), and a new macrophorin analogue, 2',3'-epoxy-13-hydroxy-4'-oxomacrophorin a (3), have been isolated from a fungicolous isolate of hymenopsis sp. (myc-1703; nrrl 37638). the structures and relative configurations of these compounds were assigned on the basis of 2d nmr and ms data, and the identity of 1 was confirmed by x-ray crystallographic analysis. the absolute configuration of 2 was proposed on the basis of cd analysis using both empirical and computational ... | 2010 | 19928955 |