Brown S R, O'Brien P Q, Johnson M A. "Method for the Synthesis of Sivelestat sodium Impurity 4" [P]. US Patent, US 11540699 B2, 2016-02-05.
发明人张德明,孙丽萍,李文辉. "A Process for Preparing High-Purity Sivelestat sodium Impurity 4" [P]. 中国发明专利, 专利号 CN 114879579 A, 授权公告日 2025-01-28.
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