发明人王建平,徐明华,高志强. "Method for the Synthesis of Roflumilast Impurity 45" [P]. 中国发明专利, 专利号 CN 113678783 B, 授权公告日 2024-11-01.
Stevens L M, Hughes D C, Schröder R. "A Process for Preparing High-Purity Roflumilast Impurity 45" [P]. US Patent, US 11074440 B2, 2022-05-04.
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