Dolutegravir Impurity 2 Des F

Dolutegravir Impurity 2 Des F is a structurally related synthetic byproduct arising from incomplete fluorination during Dolutegravir synthesis. It retains the core 5-pyrimidinyl cyclopropylmethyl sulfonamide scaffold but lacks the 5-fluoro substituent present in the parent drug, resulting in altered electronic and steric properties. The absence of fluorine at the pyrimidine ring introduces a des-F configuration, rendering it a key degradation analog under acidic stress conditions. This impurity features a zwitterionic sulfonamide linkage and a rigid bicyclic framework, critical for integrase inhibitor pharmacophore interactions. It serves as an HPLC reference standard for quantifying process-related impurities in Dolutegravir formulations.