1. 异丙托溴铵杂质2(3-氧代-2-苯基丙酸乙酯)

    异丙托溴铵杂质2(3-氧代-2-苯基丙酸乙酯)

    Ipratropium Bromide Impurity 2 (Ethyl 3-oxo-2-phenylpropanoate)

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