(9R,10R)-9,10-dimethyl-15,17-dioxatetracyclo[10.7.0.02,7.014,18]nonadeca-1(19),2,6,12,14(18)-pentaene-4,5-dione 、
邻苯二胺 生成 (12R,13R)-12,13-dimethyl-5,7-dioxa-18,25-diazahexacyclo[13.12.0.02,10.04,8.017,26.019,24]heptacosa-1(27),2,4(8),9,15,17,19,21,23,25-decaene