马来酸酐 、
15-anti,19-anti-Dimethoxy-octacyclo<12.5.1.02,7.02,13.07,18.08,13.08,16.017,20>icosa-3,5,9,11-tetraen 以
甲苯 为溶剂,
以95%的产率得到syn-16,anti-21-Dimethoxyundecacyclo<11.9.0.0
1,6.0
2,14.0
2,20.0
3,8.0
7,12.0
9,14.0
13,17.0
15,19.0
18,22>docos-10-ene-anti-4,anti-5-dicarboxylic anhydride