Ball-and-stick model of the L -arginine molecule, C ₆ H ₁₄ N ₄ O ₂ , in the zwitterionic form found in the crystal structure determined by powder X-ray diffraction (PXRD) and reported in Chem. Commun. (2012), 48 , 2761-2763 ( CSD entry TAQBIY ).

Colour code:

Carbon, C: grey

Hydrogen, H: white

Nitrogen, N: blue

Oxygen, O: red