(5S,6R,7R,10S)-6-ethoxycarbonyl-7-hydroxy-15,16-dimethoxy-10-methoxycarbonyl-2,8-dioxoerythrinan 在
sodium hydroxide 作用下,
以
乙醇 为溶剂,
生成 (4aR,5R,8S,13bS)-5-Hydroxy-11,12-dimethoxy-3,6-dioxo-1,2,3,4,5,6,8,9-octahydro-indolo[7a,1-a]isoquinoline-4a,8-dicarboxylic acid 4a-ethyl ester