发明人周伟,何建平,高志强. "Method for the Synthesis of Tulobuterol Impurity N4" [P]. 中国发明专利, 专利号 CN 113165898 B, 授权公告日 2024-11-26.
发明人徐明华,杨光,胡光. "A Process for Preparing High-Purity Tulobuterol Impurity N4" [P]. 中国发明专利, 专利号 CN 114288304 A, 授权公告日 2015-06-24.
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