发明人黄志刚,高志强,韩伟. "Method for the Synthesis of Letrozole Impurity 33" [P]. 中国发明专利, 专利号 CN 111411830 B, 授权公告日 2017-05-22.
发明人何建平,郑宇鹏,王建平. "A Process for Preparing High-Purity Letrozole Impurity 33" [P]. 中国发明专利, 专利号 CN 115414930 A, 授权公告日 2020-05-08.
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