methyl (2S,3R,4S)-4-[2-[2-(3,4-dihydroxyphenyl)ethoxy]-2-oxoethyl]-3-ethenyl-2-[(2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-3,4-dihydro-2H-pyran-5-carboxylate 生成 methyl (2S,3R,4S)-4-[2-[2-(3,4-diacetyloxyphenyl)ethoxy]-2-oxoethyl]-3-ethenyl-2-[(2S,3R,4S,5R,6R)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxy-3,4-dihydro-2H-pyran-5-carboxylate