4a,7-Dihydroxy-4,6-dimethoxy-9-(4-methoxy-phenyl)-1-[1-(4-methoxy-phenyl)-meth-(Z)-ylidene]-9,9a-dihydro-1H,4aH-xanthen-2-one 、
乙酸酐 在
sodium acetate 、
锌 作用下,
生成
Acetic acid 4-acetoxy-2-[(1R,2S)-2-(2,5-diacetoxy-4-methoxy-phenyl)-1,2-bis-(4-methoxy-phenyl)-ethyl]-5-methoxy-phenyl ester 、 Acetic acid 4-acetoxy-2-[(1R,2R)-2-(2,5-diacetoxy-4-methoxy-phenyl)-1,2-bis-(4-methoxy-phenyl)-ethyl]-5-methoxy-phenyl ester