(1S,3S,5Z,7R,8E,11R,13E,15S,17R,21R,23R,25S)-1,11,21-三羟基-17-[(1R)-1-羟基乙基]-5,13-二(2-甲氧基-2-氧代乙亚基)-10,10,26,26-四甲基-19-氧代-18,27,28,29-四氧杂四环[21.3.1.13,7.111,15]二十九碳-8-烯-25-基3-甲基丁酸酯
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