This compound can be obtained by two different ways: 1) The Friedel Crafts' condensation of trans-4-aminomethylcyclohexylcarbonyl chloride (I) with methyl 3-phenylpropionate (II) by means of AlCl3 in refluxing S2C gives methyl 3-[4-trans-4-aminomethylcyclohexylcarbonyl)phenyl]propionate (III), which is then hydrolyzed with hot aqueous concentrated HCl. 2) By isomerization of 3-[4-(cis-4-aminomethylcyclohexylcarbonyl)phenyl]propionic acid (IV) in hot aqueous 3N HCl.