8,13-epoxy-7β-[N-(2-methoxy-2-methylpropionyloxy)aminocarbonyloxy]-1α,6β,9α-trihydroxylabd-14-en-11-one 生成 [[(3R,4aR,5S,6S,6aS,10S,10aR,10bS)-10-[2-(tert-butylamino)acetyl]oxy-3-ethenyl-6,10b-dihydroxy-3,4a,7,7,10a-pentamethyl-1-oxo-5,6,6a,8,9,10-hexahydro-2H-benzo[f]chromen-5-yl]oxycarbonylamino] 2,2-dimethylpropanoate