70. (1R,2S)-1,2-Dimethyl-3,6-epoxyhexahydroftalanhydrid** (3alfa, 7alfa-dimethylhexahydro-4,7-epoxyisobenzofuran-1,3-dion, kantharidin);
(1R,2S)-Hexahydro-1,2-dimethyl-3,6-epoxyphtalic anhydride (cantharidin)***
70. (1R,2S)-1,2-Dimethyl-3,6-epoxyhexahydroftalanhydrid** (3alfa, 7alfa-dimethylhexahydro-4,7-epoxyisobenzofuran-1,3-dion, kantharidin);
(1R,2S)-Hexahydro-1,2-dimethyl-3,6-epoxyphtalic anhydride (cantharidin)***