(R)-[1-[[[(4-methylphenyl)sulfonyl]oxy]methyl]-2-phenylethyl]carbamic Acid Phenylmethyl Ester, is the labeled analogue of (R)-[1-[[[(4-methylphenyl)sulfonyl]oxy]methyl]-2-phenylethyl]carbamic Acid Phenylmethyl Ester, which is an intermediate for the synthesis of Dextroamphetamine Sulfate (A634240) and Metamphetamine hydrochloride.