4,7-Epoxy-1H-isoindole-1,3(2H)-dione, hexahydro-2,3a,7a-trimethyl-, (3aalpha,4beta,7beta,7aalpha)- 76970-78-0 Cantharidin methylimide Hexahydro-2,3a,7a-trimethyl-4,7-epoxy-1H-isoindole-1,3(2H)-dione