tert-Butyl ((R)-2-(3-Chlorophenyl)-2-hydroxyethyl)((1S,3R)-3-(3-hydroxyphenyl)cyclohexyl)carbamate is an intermediate in the synthesis of 2-(3-((1R,3S)-3-(((R)-2-(3-Chlorophenyl)-2-hydroxyethyl)amino)cyclohexyl)phenoxy)acetic Acid-13C, d2 Sodium Salt (C376612), a labeled beta3-adrenoceptor selective agonist and a labeled active metabolite of TT-138 which relaxes urinary bladder through beta3-adrenoceptor stimuli.