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