Ball-and-stick model of an aminocaproic acid molecule, C₆H₁₃NO₂, 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, RNH₃⁺, and a deprotonated carboxylate group, RCO₂⁻.

Colour code:

  Carbon, C: grey

  Hydrogen, H: white

  Nitrogen, N: blue

  Oxygen, O: red