 5-Aminohexanoic acid

The compound $\mathrm{H}{\mathrm{O}}_2\mathrm{C}(\mathrm{C}{\mathrm{H}}_2{)}_3\mathrm{CH}(\mathrm{N}{\mathrm{H}}_2)\mathrm{Me}$. Regioselected ring expansion of 2-methylcyclopentanone followed by lactam hydrolysis is a constitutional synthetic disconnection.