The molecule is a 10-membered lactone obtained from 10-methyl-9,10-dihydro-2H-oxecin-2-one by the epoxidation of the double bond at position 3-4 and cis-dihydroxylation of the double bond at position 7-8, with further acylation of the hydroxy group at position 8 by a but-2-enoyl group. Multiplolide B was first isolated from the fungus Xylaria multiplex BCC 1111. It shows antifungal activity against Candida albicans. The epoxide group has cis-configuration, but its configuration relative to the other substituents was not established. It has a role as a metabolite and an antifungal agent. It is a lactone, an epoxide and a secondary alcohol.
[(4R,6R,7S,8E)-7-hydroxy-4-methyl-2-oxo-3,11-dioxabicyclo[8.1.0]undec-8-en-6-yl] (E)-but-2-enoate