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2-羰基-6-戊基-2H-吡喃-3-羧酸
5-{[17'-{[4,5-dihydroxy-5-(1-hydroxyethyl)-6-methyltetrahydro-2H-pyran-2-yl]oxy}-19'-(dimethoxymethyl)-10',13'-dihydroxy-6'-methoxy-3'-methyl-11'-oxospiro[oxirane-2,18'-[16,20,22]trioxahexacyclo[17.2.1.0~2,15~.0~5,14~.0~7,12~.0~17,21~]docosa[2(15),3,5(14)