(1aS,2S,10R,10aR)-3,8-dimethoxy-10a-methyl-9-oxo-7-(2,2,2-trifluoroacetoxy)-1a,9,10,10a-tetrahydro-2H-benzo[6,7]fluoreno[2,3-b]oxirene-2,10-diyl diacetate

(1aS,2S,10R,10aR)-3,8-dimethoxy-7-(methoxymethoxy)-10a-methyl-9-oxo-1a,9,10,10a-tetrahydro-2H-benzo[6,7]fluoreno[2,3-b]oxirene-2,10-diyl diacetate