O'Brien P Q, Brown S R, Anderson J P. "Method for the Synthesis of Doxofylline Impurity 40" [P]. US Patent, US 9369921 B2, 2024-06-09.
Fischer A B, Hughes D C, Stevens L M. "A Process for Preparing High-Purity Doxofylline Impurity 40" [P]. US Patent, US 9006995 B2, 2020-02-22.
参考文献 Literature
Fischer P, Wagner E. "Development and Validation of an LC-MS/MS Method for the Determination of 多索茶碱杂质40 in Pharmaceutical Formulations". J. Nat. Prod., 2019, 2472, 9633-9641.
Zhou X P, Huang L, Wu G. "A Stability-Indicating HPLC Method for the Separation and Quantification of 多索茶碱杂质40 as an Impurity". Molecules, 2016, 162, (6), 2071-2089.
Martinez C, Lopez D R. "Identification and Structural Characterization of a Novel Degradation Product of Doxofylline Impurity 40 Using HRMS and NMR". Environ. Sci. Technol., 2017, 2471, 3142-3159.