生成 (4bR,8bR,8dS)-4b-Methyl-4b,8d-dihydro-dibenzo[a,f]cyclopropa[cd]pentalene-8b,8c-dicarboxylic acid dimethyl ester 、 (4bR,8bS,8dR)-8d-Methyl-4b,8d-dihydro-dibenzo[a,f]cyclopropa[cd]pentalene-8b,8c-dicarboxylic acid dimethyl ester 、
(5E,11E)-6-Methyl-dibenzo[a,e]cyclooctene-5,12-dicarboxylic acid dimethyl ester