methyl (2S,4aR,6aR,7R,9S,10aS,10bR)-9-acetyloxy-2-(2,5-dimethoxyoxolan-3-yl)-6a,10b-dimethyl-4,10-dioxo-2,4a,5,6,7,8,9,10a-octahydro-1H-benzo[f]isochromene-7-carboxylate 以
水 、
乙腈 为溶剂,
以23 mg的产率得到methyl (2S,4aR,6aR,7R,9S,10aS,10bR)-9-acetyloxy-2-[(2R,3S,5S)-2,5-dimethoxyoxolan-3-yl]-6a,10b-dimethyl-4,10-dioxo-2,4a,5,6,7,8,9,10a-octahydro-1H-benzo[f]isochromene-7-carboxylate