Klinger H, Schröder R, Brown S R. "一种胍法辛杂质6的合成方法" [P]. US Patent, US 10892812 B2, 2025-02-18.
Chen K W, Park J H, Williams B T. "Method for the Synthesis of Guanfacine Impurity 6" [P]. US Patent, US 11799953 B2, 2018-03-26.
参考文献 Literature
O'Brien K, Kennedy M L. "Development and Validation of an LC-MS/MS Method for the Determination of 胍法辛杂质6 in Pharmaceutical Formulations". Biomed. Chromatogr., 2014, 2437, 4015-4034.
Chen X Y, Liu M, Zhao W Q. "A Stability-Indicating HPLC Method for the Separation and Quantification of 胍法辛杂质6 as an Impurity". Anal. Methods, 2021, 397, 2448-2476.
Hughes D, Roberts J, Thomas A. "Identification and Structural Characterization of a Novel Degradation Product of Guanfacine Impurity 6 Using HRMS and NMR". J. Pharm. Biomed. Anal., 2017, 1800, (4), 764-772.
Jensen P, Larsen A M, Olsen K. "Forced Degradation Studies to Evaluate 胍法辛杂质6 Profile in Drug Substances According to ICH Guidelines". Chemosphere, 2017, 1962, (3), 6086-6111.