The molecule is zwitterionic form of 3-(pyrazol-1-yl)-L-alanine having an anionic carboxy group and a protonated alpha-amino group; major species at pH 7.3. It is a tautomer of a 3-(pyrazol-1-yl)-L-alanine.
(2S)-2-azaniumyl-3-pyrazol-1-ylpropanoate