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- W2000258438 abstract "An unknown impurity formed during stability sample analysis by a gradient reversed phase ultra-high pressure liquid chromatography (UHPLC) of varenicline tablets at 0.2% level. A simple isocratic preparative method was developed to isolate the unknown impurity with 20 min run time. This unknown impurity was identified and characterized by using spectroscopic techniques. Based on the spectral data, the unknown impurity has been characterized as 4,6,7,8,9,10-hexahydro-1H-6,10-methanopyrazino[2,3-h][3]benzazepine-2,3-dione. The structure of this impurity was also established unambiguously, prepared by isolation and co-injected into UHPLC to confirm the retention time. To the best of our knowledge, this impurity has not been reported elsewhere." @default.
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- W2000258438 date "2012-01-01" @default.
- W2000258438 modified "2023-09-25" @default.
- W2000258438 title "Identification, Ssolation and Characterization of an Unknown Impurity of Varenicline" @default.
- W2000258438 doi "https://doi.org/10.3797/scipharm.1201-08" @default.
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