英文别名Roflumilast Impurity IV; N-(3,5-Dichloropyrid-4-yl)-3,4-bis-difluoromethoxybenzamide; N-(3,5-Dichloro-4-pyridinyl)-3,4-bis(difluoromethoxy)benzamide; 3,4-Bis(difluoromethoxy) Roflumilast; Roflumilast Impurity 7; Bis-difluoromethoxy Roflumilast impurity; N-(3,5-dichloro-4-pyridyl)-3,4-bis(difluoromethoxy)benzamide; Benzamide, N-(3,5-dichloro-4-pyridinyl)-3,4-bis(difluoromethoxy)-; Roflumilast Impurity 2; Roflumilast Impurity H 
