51212-98-7 [8-(acetyloxy)-3-methylidene-2,6-dioxo-2,3,3a,4,8,9,10,12a-octahydro-4,7-(metheno)furo[3,2-c]oxacycloundecin-11(6H)-yl]methyl acetate 35606-75-8 2-[(3R,3aR,7aS)-3a-[(1R,6S,8aR)-1-(3-furyl)-5,8a-dimethyl-3-oxo-4,6,7,8-tetrahydro-1H-isochromen-6-yl]-2,2-dimethyl-6-oxo-3,4,7,7a-tetrahydrofuro[3,2-c]pyran-3-yl]acetic acid