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