Ribavirin EP Impurity G (Free Base) | CAS 39030-43-8 | also known as Ribavirin N-Isomer or 2-[(2R | 3R | 4S | 5R)-3 | 4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]-1 | 2 | 4-triazole-3-carboxamide | is a configurational isomeric impurity encountered during ribavirin manufacture. It is routinely characterized in impurity profiles by orthogonal analytical methods such as reversed phase HPLC with UV detection and LC-MS for accurate mass confirmation. The impurity exhibits moderate polarity and aqueous solubility typical of ribose-containing nucleosides and may arise from N-ribosylation isomerization under acidic or thermal stress. Detailed retention behavior | MS fragmentation data and qualified limits inform control strategies | specification setting and stability assessments during process development.
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