dimethyl (1'R,2'R)-spiro[benzo[7]annulene-7,3'-cyclopropane]-1',2'-dicarboxylate 、
4-苯基脲唑 生成 dimethyl (1'R,2'R)-4,6,17,19-tetraoxo-5,18-diphenylspiro[3,5,7,16,18,20-hexazahexacyclo[7.6.5.12,8.03,7.010,15.016,20]henicosa-10,12,14-triene-21,3'-cyclopropane]-1',2'-dicarboxylate