2-[[(2S)-pyrrolidine-2-carbonyl]amino]acetic acid 2-[[oxo-[(2S)-2-pyrrolidinyl]methyl]amino]acetic acid 2-[[(2S)-pyrrolidin-2-yl]carbonylamino]ethanoic acid L-Prolyl-glycine 2-[[(2S)-pyrrolidin-1-ium-2-carbonyl]amino]acetate 2-[[oxo-[(2S)-2-pyrrolidin-1-iumyl]methyl]amino]acetate 2-[[(2S)-pyrrolidin-1-ium-2-yl]carbonylamino]ethanoate ZINC04899418