Glipizide dimer impurity
Glipizide dimer impurity is a head-to-tail dimeric derivative formed via covalent linkage between the urea nitrogen of one Glipizide molecule and the electrophilic carbon of another, resulting in a symmetrical bis-glipizide structure. The compound retains the core pyridine and sulfonylurea moieties of the parent drug, with extended conjugation and enhanced hydrophobicity. This impurity arises as a synthetic byproduct during API manufacturing under non-optimized conditions. It serves as an HPLC reference standard for quantifying dimeric degradation pathways in quality control.
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