Flupirtin

Flupirtin is a fluorinated piperazine-derived analgesic featuring a 1H-pyrazole ring fused to a substituted benzene core, with a terminal amide functionality. The molecule incorporates a 4-fluorophenyl group linked via a methylene bridge to a piperazine-1-carboxamide moiety, establishing its structural identity as the parent drug. The presence of a pyrazole ring and fluorine substituent imparts distinct electronic and steric properties, critical for its pharmacological profile. This compound serves as an HPLC reference standard for quantitative analysis of Flupirtin-related substances in pharmaceutical formulations.