1 CSH [2-(2-hydroxy-1-methyl-ethyl)-4-(1h-imidazol-4-ylmethyl)-5-oxo-imidazolidin-1-yl]-acetic acid 1.000 2 IIC 4-imidazolmethylene-5-imidazolone chromophore 1.000 3 CRG [2-(1-amino-2-hydroxy-propyl)-4-(3h-imidazol-4-ylmethylene)-5-oxo-4,5-dihydro-imidazol-1-yl]-acetic acid 0.952 4 XXY 2-[(1r,2r)-1-amino-2-hydroxypropyl]-1-(carboxymethyl)-4-(1h-imidazol-5-ylmethyl)-1h-imidazol-5-olate 0.952 5 SWG 2-[(4z)-2-[(1r)-1-amino-2-hydroxy-ethyl]-4-(1h-indol-3-ylmethylidene)-5-oxo-imidazol-1-yl]ethanoic acid 0.760 6 B2H Chromophore (thr, trp, gly) 0.731 7 CRF [(4z)-2-[(1r,2r)-1-amino-2-hydroxypropyl]-4-(1h-indol-3-ylmethylidene)-5-oxo-4,5-dihydro-1h-imidazol-1-yl]acetic acid 0.731 8 KWS {2-[(1r,2r)-1-amino-2-hydroxypropyl]-4-methylidene-5-oxo-4,5-dihydro-1h-imidazol-1-yl}acetic acid 0.714 9 4F3 [2-(1-amino-2-hydroxy-propyl)-4-(4-fluoro-1h-indol-3-ylmethyl)-5-hydroxy-imidazol-1-yl]-acetic acid 0.704 10 5ZA (5z)-2-[(1s,2r)-1-amino-2-hydroxypropyl]-5-[(4-amino-1h-indol-3-yl)methylene]-3-(2-hydroxyethyl)-3,5-dihydro-4h-imidazol-4-one 0.704 11 MDO {2-[(1s)-1-aminoethyl]-4-methylidene-5-oxo-4,5-dihydro-1h-imidazol-1-yl}acetic acid 0.700