5,5'-Dihydroxy-1,12,1',12'-tetramethyl-[6,6']bi[benzo[c]phenanthrenyl]-8,8'-dicarboxylic acid dimethyl ester 、
(1S)-(-)-莰烷酰氯 在
三乙胺 作用下,
生成 、 1,12,1',12'-Tetramethyl-5'-((1R,4S)-4,7,7-trimethyl-3-oxo-2-oxa-bicyclo[2.2.1]heptane-1-carbonyloxy)-5-((1S,4R)-4,7,7-trimethyl-3-oxo-2-oxa-bicyclo[2.2.1]heptane-1-carbonyloxy)-[6,6']bi[benzo[c]phenanthrenyl]-8,8'-dicarboxylic acid dimethyl ester