Teneligliptin Impurity-II

Teneligliptin Impurity-II is a synthetically derived byproduct generated during the construction of the sulfonamide moiety in the parent drug's synthesis. It retains the core pyrazine-sulfonamide scaffold but features an altered cyclopropylmethyl substituent due to incomplete alkylation. This structural deviation results in distinct chromatographic and spectroscopic properties, enabling its identification in quality control analyses. It serves as a critical HPLC reference standard for quantifying process-related impurities in teneligliptin active pharmaceutical ingredient batches.