5,7-Dihydroxy-4a,9-dimethyl-3-methylenedecahydrofuro(2',3':5,6)cyclohepta(1,2-c)pyran-2(3H)-one 57074-51-8 Furo(2',3':5,6)cyclohepta(1,2-c)pyran-2(3H)-one, decahydro-5,7-dihydroxy-4a,9-dimethyl-3-methylene- HSDB 3494 Hymenovin