4-[2-(5-Methylpyrazinyl-2-carboxamido)ethyl]benzenesulfonamide ; 4-[2-(5-Methylpyrazine-2-carboxamido)ethyl]benzenesulfonamide ; N-[2-[4-(Aminosulfonyl)phenyl]ethyl]-5-methyl-2-pyrazinecarboxamide ; 4-[beta-(5-Methylpyrazinyl-2-carboxamido)ethyl]benzene Sulfonamide ; Glipizide Related Compound A (USP) ; Glipizide EP Impurity A (Freebase)