Dolutegravir O-methyl impurity is a fluorinated pyrimidinone derivative featuring a methyl ether substitution at the 5-position of the pyridone ring. This compound retains the core bicyclic scaffold of Dolutegravir but incorporates an O-methylated lactam side chain, altering hydrogen bonding capacity. Structurally, it arises from methylation of the parent drug's hydroxyl group during synthetic processes. This impurity serves as an HPLC reference standard for quantifying process-related variants in Dolutegravir formulations.
