Ball-and-stick model of an aminocaproic acid molecule, C ₆ H ₁₃ NO ₂ , from the crystal structure reported in CSD entry AMCAPR11 (G. J. Reiss, CSD Communication , 2010). The molecule exists as a zwitterion in the crystal, with a protonated ammonium group, RNH ₃ ⁺ , and a deprotonated carboxylate group, RCO ₂ ⁻ .

Colour code:

Carbon, C: grey

Hydrogen, H: white

Nitrogen, N: blue

Oxygen, O: red