Eupacunoxin

(2R,3R)-2,3-Dimethyl-2-oxiranecarboxylic acid [(3aS,4R,5Z,7S,9S,10Z,11aR)-9-acetoxy-2,3,3a,4,7,8,9,11a-octahydro-7-hydroxy-6,10-dimethyl-3-methylene-2-oxocyclodeca[b]furan-4-yl] ester