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4-Piperidone (hydrochloride hydrate) (Item No. 21961) is an analytical reference standard categorized as a piperidine. It is a starting material in the synthesis of fentanyl (hydrochloride) (Item Nos. ISO60197 | 14719) with phenethylbromide . The physiological and toxicological properties of this compound are not known. This product is intended for research and forensic applications.