1-Piperidineacetamide, N-(4-hydroxy-5-oxo-1,3,6-cycloheptatrien-1-yl)-, monohydrochloride 18188-83-5 N-(4-Hydroxy-5-oxo-1,3,6-cycloheptatrien-1-yl)-1-piperidineacetamide hydrochloride