Phomadecalins A-D and phomapentenone A: new bioactive metabolites from Phoma sp. NRRL 25697, a fungal colonist of Hypoxylon stromata

Five new natural products, phomadecalins A-D (1-4) and phomapentenone A (5), have been obtained from cultures of Phoma sp. (NRRL 25697), a fungal colonist isolated from the stromata of Hypoxylon sp. The structures of these compounds were elucidated through a series of 1D and 2D NMR experiments. Compounds 1-4 display activity against Gram-positive bacteria.