1 C99 {(2r)-2-[(1s,2r)-1-amino-2-hydroxypropyl]-2-hydroxy-4,5-dioxoimidazolidin-1-yl}acetic acid 1.000 2 KWS {2-[(1r,2r)-1-amino-2-hydroxypropyl]-4-methylidene-5-oxo-4,5-dihydro-1h-imidazol-1-yl}acetic acid 0.833 3 CR5 (2r)-2-(aminomethyl)-2,4-dihydroxy-5-oxo-3-(2-oxoethyl)-2,5-dihydro-1h-imidazol-3-ium 0.824 4 Q2K 2-[2-(3-methylsulfanylpropanimidoyl)-4,5-bis(oxidanylidene)imidazol-1-yl]ethanoic acid 0.789 5 CRX [2-(1-aminoethyl)-2-hydroxy-4-methylene-5-oxoimidazolidin-1-yl]acetic acid 0.778 6 CLV {(2s)-2-[(1s)-1-aminoethyl]-5-oxo-2,5-dihydro-1h-imidazol-1-yl}acetic acid 0.765 7 MDO {2-[(1s)-1-aminoethyl]-4-methylidene-5-oxo-4,5-dihydro-1h-imidazol-1-yl}acetic acid 0.722 8 CR0 [2-(1-amino-2-hydroxypropyl)-2-hydroxy-4-isobutyl-5-oxo-2,5-dihydro-1h-imidazol-1-yl]acetaldehyde 0.714