Three structurally-related impurities in norvancomycin drug substance

Norvancomycin (NVCM) is widely used in China to treat bacterial infections of Gram-positive cocci and bacilli, especially infections of methicillin-resistant Staphylococcus aureus and methicillin-resistant Staphylococcus epidermidis. This study is a chemical investigation of the drug substance of NVCM, and led to the identification, by 1D, 2D NMR spectra and HRESIMS, of three as yet undescribed impurities, one D-O-E ring expanded NVCM analog (1) and two derivatives of NVCM lacking sugars (2, 3).