(1S,4aS,8R,8aS)-1-[(2S,3R,4S,5S,6R)-6-[[(E)-3-(3,4-二羟基苯基)丙-2-烯酰基]氧基甲基]-3,4,5-三羟基四氢吡喃-2-基]氧基-8-甲基-6-氧代-4A,5,8,8alpha-四氢-1H-吡喃并[5,4-c]吡喃-4-羧酸 生成 (1R,4aS,8S,8aS)-1-methyl-3-oxo-8-[(2S,3R,4S,5R,6R)-3,4,5-triacetyloxy-6-[[(E)-3-(3,4-diacetyloxyphenyl)prop-2-enoyl]oxymethyl]oxan-2-yl]oxy-4,4a,8,8a-tetrahydro-1H-pyrano[3,4-c]pyran-5-carboxylic acid