3-吡啶羧酸,(8R,9R,10R,11S,12R,13R,14R,15S,18S,19S,20S,21S,22R)-10,13,21-三(乙酰氧基)-12-[(乙酰氧基)甲基]-5,7,8,9,10,12,13,14,15,17,18,19-十二氢-20-羟基-8,18,19,20-四甲基-22-(2-甲基-1-羰基丙氧基)-8,11-环氧-9,12-乙基桥-11
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