4-Piperidone hydrochloride41979-39-931 % similar 4,4-Difluorocyclohexanamine458566-84-231 % similar 4-Hydroxypiperidinium chloride5382-17-231 % similar 4-Chloropiperidine hydrochloride5382-19-431 % similar Thiomorpholine 1,1-dioxide hydrochloride59801-62-631 % similar 4-(Trifluoromethyl)piperidine657-36-331 % similar