Synonyms: 2-Piperidineaceticacid, a-phenyl-, methyl ester,hydrochloride, (R*,R*)-(?à)-; 2-Piperidineacetic acid, a-phenyl-, methyl ester, hydrochloride, (aR,2R)-rel- (9CI); 2-Piperidineacetic acid, a-phenyl-, methyl ester,hydrochloride, threo-(?à)- (8CI); 2-Piperidineacetic acid, a-phenyl-, methyl ester, hydrochloride, (R*,R*)-; DL-threo-Methylphenidatehydrochloride; Methyl threo-a-phenyl-a-(2-piperidyl)acetatehydrochloride; dl-threo-Methylphenidate hydrochloride