(2R)-2-ammonio-3-pyridin-4-ylpropanoate , with CAS number of 174096-41-4, can be called 3-(4-Pyridinyl)-D-alanine ; 3-Pyridin-4-yl-D-alanin ; 4-pyridinepropanoic acid, alpha-amino-, (alphaR)- ; 3-Pyridin-4-yl-L-alanine .