5,7-dihydroxy-2-(4-hydroxyphenyl)-6,8-bis[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]-2,3-dihydrochromen-4-one 以25 mg的产率得到Acetic acid (R)-5-acetoxy-2-(4-acetoxy-phenyl)-4-oxo-6,8-bis-(3,4,5-triacetoxy-6-acetoxymethyl-tetrahydro-pyran-2-yl)-chroman-7-yl ester