Used as an intermediate in the synthesis of pharmaceuticals, particularly in the production of certain antibiotics and anticonvulsants. Also employed in the preparation of pesticides and plant growth regulators. Acts as a reagent in analytical chemistry for the detection and quantification of carbonyl compounds like aldehydes and ketones, forming semicarbazones. Utilized in the textile industry to improve dye fastness and as a crosslinking agent in resin formulations. Has been used in some hair dye formulations and polymer modification processes. Historically used in food preservation, though restricted now due to toxicological concerns.