发明人徐明华,马晓峰,赵玉洁. "Method for the Synthesis of Letrozole EP Impurity B" [P]. 中国发明专利, 专利号 CN 114031537 A, 授权公告日 2023-12-07.
发明人张德明,杨光,钱学锋. "A Process for Preparing High-Purity Letrozole EP Impurity B" [P]. 中国发明专利, 专利号 CN 113634484 B, 授权公告日 2015-01-22.
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