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Klinger H, Brown S R, Mueller T. "Method for the Synthesis of 4-methoxy-1-methyl-1H-pyrazolo[3,4-b]pyridine-5-carboxylic acid" [P]. US Patent, US 11473297 B2, 2022-02-21.
发明人徐明华,陈志强,张德明. "A Process for Preparing High-Purity 4-methoxy-1-methyl-1H-pyrazolo[3,4-b]pyridine-5-carboxylic acid" [P]. 中国发明专利, 专利号 CN 108097628 A, 授权公告日 2023-11-13.
参考文献 Literature
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