Lee S K, Fischer A B, Roberts E F. "Method for the Synthesis of Tolterodine Benzopyranone Impurity" [P]. US Patent, US 10255912 B2, 2015-02-09.
发明人李文辉,胡光,马晓峰. "A Process for Preparing High-Purity Tolterodine Benzopyranone Impurity" [P]. 中国发明专利, 专利号 CN 114169404 A, 授权公告日 2022-11-08.
参考文献 Literature
Kim S H, Park J Y. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Biomed. Chromatogr., 2010, 564, 9158-9166.
Jensen P, Larsen A M, Olsen K. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Talanta, 2015, 2236, (11), 5397-5400.
Garcia M, Rodriguez P. "Identification and Structural Characterization of a Novel Degradation Product of Tolterodine Benzopyranone Impurity Using HRMS and NMR". Chromatographia, 2010, 1871, (6), 5686-5691.