108-24-7
乙酸酐
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72674-29-4
9β,11β-环氧-6α-氟-17,21-二羟基孕-1,4-二烯-3,20-二酮 17,21-二(乙酸酯)
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76868-97-8
5-[(E)-but-2-enoyl]-4-methoxy-6-methylpyran-2-one