dimethyl (2S,3R,8R,9S)-2,8-dihydroxy-3,9-dimethyl-1,6,7,12-tetrazatricyclo[7.3.0.03,7]dodeca-5,11-diene-5,11-dicarboxylate 、
甲醇 生成
4,9-dimethoxy-3a,8a-dimethyl-3a,4,8a,9-tetrahydro-3H,8H-dipyrazolo[1,5-a;1',5'-d]pyrazine-2,7-dicarboxylic acid dimethyl ester