1-(Hydrazinocarbonylmethyl)pyridinium chloride 1126-58-5 AI3-61627 EINECS 214-421-4 Girard P reagent NSC 9469 Pyridinium, 1-(2-hydrazino-2-oxoethyl)-, chloride Pyridinium, 1-(carboxymethyl)-, chloride, hydrazide (8CI)