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)