dimethyl 9-<(S)-(-)-N-acetylalanyloxy>methyl-9,10-dihydro-9,10-etheno-anthracene-11,12-dicarboxylate 生成 8d-((S)-2-Acetylamino-propionyloxymethyl)-4b,8d-dihydro-dibenzo[a,f]cyclopropa[cd]pentalene-8b,8c-dicarboxylic acid dimethyl ester 、 4b-((S)-2-Acetylamino-propionyloxymethyl)-4b,8d-dihydro-dibenzo[a,f]cyclopropa[cd]pentalene-8b,8c-dicarboxylic acid dimethyl ester