Bioactive polyketides from the fungus Astrocystis sp BCC 22166

Five new compounds, phthalide 1, dihydroisocoumarin 2, and 3, pyrone 4, and benzophenone 5, together with nine known compounds, 3,4-dihydro-4,5,8-trihydroxy-3-methylisocoumarin, sclerotinin A, methyl-8-hydroxy-6-methylxanthone-1-carboxylate, sydowinin A, conioxanthone A, 1,3,8-trihydroxy-6-methylxanthone, 1,8-dihydroxy-3-methoxy-6-methylxanthone, coniochaetone B, and xylaranol B, were isolated from the fungus Astrocystis sp. BCC 22166. Structures of these compounds were elucidated using NMR spectroscopic and MS spectrometric analyses. Compound I exhibited antibacterial activity against Bacillus cereus (IC50=12.5 mu g/mL) while compound 2 showed cytotoxicity to KB and Vero cells (IC50=22.6 and 48.2 mu g/mL). (C) 2014 Elsevier Ltd. All rights reserved.