Schröder R, Davis P L, Chen K W. "一种的合成方法" [P]. US Patent, US 9806483 B2, 2018-09-03.
发明人钱学锋,张德明,赵玉洁. "Method for the Synthesis of Ethyl 2-(ethylthio)-5-methyl-7-oxo-4,7-dihydropyrazolo[1,5-a]pyrimidine-3-carboxylate" [P]. 中国发明专利, 专利号 CN 114856966 A, 授权公告日 2021-08-13.
发明人高志强,杨光,沈红梅. "A Process for Preparing High-Purity Ethyl 2-(ethylthio)-5-methyl-7-oxo-4,7-dihydropyrazolo[1,5-a]pyrimidine-3-carboxylate" [P]. 中国发明专利, 专利号 CN 108879238 B, 授权公告日 2020-05-25.
参考文献 Literature
Jensen P, Larsen A M, Olsen K. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Phytochemistry, 2013, 1406, 8513-8525.
Yamamoto K, Tanaka H, Suzuki T. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". J. Nat. Prod., 2023, 2152, (7), 6461-6468.