4-(Cyclopropylmethoxy)-3-(difluoromethoxy)benzaldehyde is a roflumilast impurity.
參考文獻
Dwivedi, S. P. D., et al.: From Indian Pat. Appl.?(2015),?IN?2013MU03395?A?20150717; Lohray, B. B., et al.: From Indian Pat. Appl.?(2007),?IN?2004MU00478?A?20071012
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