(5S,6S,7S,8R)-2-(2-phenylethyl)-6,7,8-trihydroxy-5,6,7,8-tetrahydro-5-<2-(2-phenylethyl)chromonyl-6-oxy>chromone 生成 [(5S,6S,7S,8R)-7,8-diacetyloxy-4-oxo-5-[4-oxo-2-(2-phenylethyl)chromen-6-yl]oxy-2-(2-phenylethyl)-5,6,7,8-tetrahydrochromen-6-yl] acetate