1 QUS (S)-2-amino-3-(3,5-dioxo-[1,2,4]oxadiazolidin-2-yl)-propionic acid 1.000 2 HWD 2-amino-3-(2,4-dioxo-3,4-dihydro-2h-pyrimidin-1-yl)-propionic acid 0.800 3 BWD 2-amino-3-(5-bromo-2,4-dioxo-3,4-dihydro-2h-pyrimidin-1-yl)-propionic acid 0.750 4 CWD 3-(5-chloro-2,4-dioxo-3,4-dihydropyrimidin-1(2h)-yl)-L-alanine 0.750 5 FWD 2-amino-3-(5-fluoro-2,4-dioxo-3,4-dihydro-2h-pyrimidin-1-yl)-propionic acid 0.750 6 IWD 2-amino-3-(5-iodo-2,4-dioxo-3,4-dihydro-2h-pyrimidin-1-yl)-propionic acid 0.750