(1aS,2S,10R,10aR)-2,7-bis((tert-butyldiphenylsilyl)oxy)-3,8-dimethoxy-10a-methyl-9-(2-(methylsulfonyl)hydrazineylidene)-1a,9,10,10a-tetrahydro-2H-benzo[6,7]fluoreno[2,3-b]oxiren-10-yl acetate

(1aS,2S,10R,10aR)-2,7-bis((tert-butyldiphenylsilyl)oxy)-9-diazo-10a-methyl-3,8-dioxo-1a,3,8,9,10,10a-hexahydro-2H-benzo[6,7]fluoreno[2,3-b]oxiren-10-yl acetate