Studies on fungal metabolites. Part 1. The structures of andibenins-A and -C, and andilesins-A, -B, and -C, meroterpenoids from Aspergillus variecolor
Five C25 metabolites have been isolated from Aspergillus variecolor, and on the basis of their spectroscopic properties, in particular 1H and 13C n.m.r., and chemical correlations, structures (2)–(6) are proposed for these metabolites. They are thus closely related to the meroterpenoid andibenin-B (1), also isolated from A. variecolor and recently shown to have a mixed polyketide–terpenoid biosynthetic origin.