dimethyl 9-oxo-5,8-diphenyl-8,9-dihydro-5H-5,8-epoxybenzo[7]annulene-6,7-dicarboxylate

重氮甲烷

1,4-diphenylisochromen-3-one

丁炔二酸二甲酯

(5R,6R,11S,12S)-5,6,11,12-tetraphenyl-5,6,11,12-tetrahydro-5,12:6,11-dimethanodibenzo[a,e][8]annulene-13,14-dione