a-Phenyl-2-piperidineacetic Acid 1-Methylethyl Ester Hydrochloride is a salt analog of a-Phenyl-2-piperidineacetic Acid 1-Methylethyl Ester (CAS# 93148-46-0), which is an ester homolog of methylphenidate with sustained and selective dopaminergic activity and reduced drug interaction liability.