Space-filling model of the L -serine molecule, C ₃ H ₇ NO ₃ , in the zwitterionic form found in the crystal structure determined by single crystal X-ray diffraction and reported in Acta Cryst. B (2005) 61 , 58-68 ( CSD entry LSERIN11 ).

Colour code:

Carbon, C: grey

Hydrogen, H: white

Nitrogen, N: blue

Oxygen, O: red