epicatechin-(4β->8)-epicatechin-(4β->6)-catechin 生成 Acetic acid (2R,3R,4R,2'R,3'R,4'S,2''R,3''S)-3,3''-diacetoxy-2,2',2''-tris-(3,4-dimethoxy-phenyl)-5,7,5',7',5'',7''-hexamethoxy-3,4,3',4',3'',4''-hexahydro-2H,2'H,2''H-[4,8';4',6'']terchromen-3'-yl ester