REL-(3AR,4S,4AS,5AR,6R,6AS)-4,4A,5,5A,6,6A-HEXAHYDRO-4,6-ETHENO-1H-CYCLOPROP(F)ISOBENZOFURAN-1,3(3AH)-DIONE
rel-(3ar,4s,4as,5ar,6r,6as)-4,4a,5,5a,6,6a-hexahydro-4,6-etheno-1h-cycloprop(f)isobenzofuran-1,3(3ah)-dione