1 CR0 [2-(1-amino-2-hydroxypropyl)-2-hydroxy-4-isobutyl-5-oxo-2,5-dihydro-1h-imidazol-1-yl]acetaldehyde 1.000 2 BJF {2-[(1s)-1-amino-3-methylbutyl]-5-hydroxy-4-(2-methylpropyl)-1h-imidazol-1-yl}acetic acid 0.773 3 KWS {2-[(1r,2r)-1-amino-2-hydroxypropyl]-4-methylidene-5-oxo-4,5-dihydro-1h-imidazol-1-yl}acetic acid 0.750 4 QLG [(4z)-2-[(1z)-4-amino-4-oxobutanimidoyl]-4-(2-methylpropylidene)-5-oxo-4,5-dihydro-1h-imidazol-1-yl]acetic acid 0.739 5 C99 {(2r)-2-[(1s,2r)-1-amino-2-hydroxypropyl]-2-hydroxy-4,5-dioxoimidazolidin-1-yl}acetic acid 0.714 6 CRX [2-(1-aminoethyl)-2-hydroxy-4-methylene-5-oxoimidazolidin-1-yl]acetic acid 0.700