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Journal of pharmaceutical and biomedical analysis

LC-NMR and LC-MS identification of an impurity in a novel antifungal drug icofungipen.


PMID 19410412

Abstract

Successful use of LC-NMR and LC-MS for rapid identification of an impurity in a novel antifungal drug icofungipen has been demonstrated. Complementary information obtained from the two methods made it possible to determine the structure of A1 prior to its isolation and purification. Stop-flow LC-NMR ((1)H and DQFCOSY), LC-MS and LC-MS/MS spectra have shown that A1 is structurally related to icofungipen. It was later isolated and prepared synthetically and its structure was corroborated by high-resolution NMR spectroscopy.

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