Maravirov disipropyl impurity

Maravirov disipropyl impurity is a process-derived byproduct formed via nucleophilic substitution during Maravirov synthesis. It retains the core diphenylsulfone scaffold of the parent drug but incorporates two isopropyl substituents at the 4- and 4'-positions of the aromatic rings, alongside a terminal amine group. The isopropyl branching introduces steric bulk, disrupting the parent compound's hydrogen-bonding capacity and reducing its pharmacological activity. This impurity arises from competitive alkylation during key intermediate formation and is quantified via HPLC-MS to ensure API batch consistency.