O'Brien P Q, Brown S R, Lee S K. "Method for the Synthesis of Pyrroloquinoline Impurity 4" [P]. US Patent, US 10065559 B2, 2016-11-02.
Kowalski A, Nowak P, Martínez F. "A Process for Preparing High-Purity Pyrroloquinoline Impurity 4" [P]. European Patent, EP 3450924 A1, 2018-08-17.
参考文献 Literature
O'Brien K, Kennedy M L. "Development and Validation of an LC-MS/MS Method for the Determination of 吡咯喹啉杂质4 in Pharmaceutical Formulations". Phytochemistry, 2025, 1631, (6), 7230-7245.
Yamamoto K, Tanaka H, Suzuki T. "A Stability-Indicating HPLC Method for the Separation and Quantification of 吡咯喹啉杂质4 as an Impurity". J. Nat. Prod., 2023, 439, (4), 6024-6048.
Mueller T, Schmidt R K. "Identification and Structural Characterization of a Novel Degradation Product of Pyrroloquinoline Impurity 4 Using HRMS and NMR". Anal. Chem., 2014, 308, (8), 6316-6324.
Zhou X P, Huang L, Wu G. "Forced Degradation Studies to Evaluate 吡咯喹啉杂质4 Profile in Drug Substances According to ICH Guidelines". Molecules, 2020, 649, 5362-5376.