发明人王建平,林芳,张德明. "Method for the Synthesis of Folic Acid Impurity 28" [P]. 中国发明专利, 专利号 CN 116577642 B, 授权公告日 2024-08-05.
Brown S R, Klinger H, Stevens L M. "A Process for Preparing High-Purity Folic Acid Impurity 28" [P]. US Patent, US 9814324 B2, 2024-04-08.
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