(3a-alpha,4-beta,9-beta,9a-alpha)-3a,4,9,9a-Tetrahydro-4,9-epoxynaphtho(2,3-c)furan-1,3-dione 109428-59-3 4,9-Epoxynaphtho(2,3-c)furan-1,3-dione, 3a,4,9,9a-tetrahydro-, (3a-alpha,4-beta,9-beta,9a-alpha)-