2,6-Epoxyoxireno(f)isobenzofuran-3,5-dione, hexahydro-, (1a-alpha,2-beta,2a-alpha,5a-alpha,6-beta,6a-alpha)- 2,6-Epoxyoxireno(f)isobenzofuran-3,5-dione, hexahydro-, (1aalpha,2beta,2aalpha,5aalpha,6beta,6aalpha)- 82660-86-4 exo-3,6-endo-Epoxy-4,5-epoxyhexahydrophthalic anhydride