Synonyms: 1-(Carboxymethyl)pyridiniumchloride, hydrazide (6CI,7CI); Pyridinium, 1-(2-hydrazino-2-oxoethyl)-,chloride (9CI); Pyridinium, 1-(carboxymethyl)-, chloride, hydrazide (8CI);1-(2-Hydrazino-2-oxoethyl)pyridinium chloride; Girard-P reagent; Girard's Preagent; Pyridinioacetohydrazide chloride; Reagents, Girard's P