6-[(11-羧基-4,4,6a,6b,8a,11,14b-七甲基-14-氧代-2,3,4a,5,6,7,8,9,10,12,12a,14a-十二氢-1H-苉-3-基)氧基]-3-(6-羧基-3,4,5-三羟基四氢吡喃-2-基)氧基-4,5-二羟基四氢吡喃-2-羧酸
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