1 B2H Chromophore (thr, trp, gly) 1.000 2 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 1.000 3 4F3 [2-(1-amino-2-hydroxy-propyl)-4-(4-fluoro-1h-indol-3-ylmethyl)-5-hydroxy-imidazol-1-yl]-acetic acid 0.962 4 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 0.962 5 SWG 2-[(4z)-2-[(1r)-1-amino-2-hydroxy-ethyl]-4-(1h-indol-3-ylmethylidene)-5-oxo-imidazol-1-yl]ethanoic acid 0.960 6 TUK 2-[2-[(1~{S})-1-azanyl-3-methylsulfanyl-propyl]-4-(1~{H}-indol-3-ylmethyl)-5-oxidanylidene-2~{H}-imidazol-1-yl]ethanal 0.889 7 IO8 2-[2-(aminomethyl)-4-(1h-indol-3-ylmethyl)-5-oxidanylidene-4h-imidazol-1-yl]ethanoic acid 0.880 8 4M9 (4z)-4-imino-4-[(4z)-4-(1h-indol-3-ylmethylidene)-5-oxo-1-(2-oxoethyl)-4,5-dihydro-1h-imidazol-2-yl]butanamide 0.857 9 A1A48 (4z)-4-{(4z)-1-(carboxymethyl)-4-[(1h-indol-3-yl)methylidene]-5-oxo-4,5-dihydro-1h-imidazol-2-yl}-4-iminobutanoic acid 0.857 10 C12 2-(1-amino-2-hydroxypropyl)-4-(4-hydroxybenzyl)-1-(2-oxoethyl)-1h-imidazol-5-olate 0.778 11 CJO [(2r,4r)-2-[(1r,2r)-1-amino-2-hydroxypropyl]-4-(4-hydroxybenzyl)-5-oxoimidazolidin-1-yl]acetic acid 0.778 12 CQ2 {(4z)-4-(4-aminobenzylidene)-2-[(1r,2r)-1-amino-2-hydroxypropyl]-5-oxo-4,5-dihydro-1h-imidazol-1-yl}acetic acid 0.778 13 CRO {2-[(1r,2r)-1-amino-2-hydroxypropyl]-4-(4-hydroxybenzylidene)-5-oxo-4,5-dihydro-1h-imidazol-1-yl}acetic acid 0.778 14 CRG [2-(1-amino-2-hydroxy-propyl)-4-(3h-imidazol-4-ylmethylene)-5-oxo-4,5-dihydro-imidazol-1-yl]-acetic acid 0.769 15 XXY 2-[(1r,2r)-1-amino-2-hydroxypropyl]-1-(carboxymethyl)-4-(1h-imidazol-5-ylmethyl)-1h-imidazol-5-olate 0.769 16 4NT [(4z)-2-[(1r,2r)-1-amino-2-hydroxypropyl]-4-(3-chloro-4-hydroxybenzylidene)-5-oxo-4,5-dihydro-1h-imidazol-1-yl]acetic acid 0.750 17 B2C {(4z)-2-[(1r,2r)-1-amino-2-hydroxypropyl]-4-[(3-bromo-4-hydroxyphenyl)methylidene]-5-oxo-4,5-dihydro-1h-imidazol-1-yl}acetic acid 0.750 18 CZO [(2r,4s)-2-[(1s,2r)-1-amino-2-hydroxypropyl]-2-hydroxy-4-(4-hydroxybenzyl)-5-oxoimidazolidin-1-yl]acetic acid 0.750 19 I1C {(4z)-2-[(1r,2r)-1-amino-2-hydroxypropyl]-4-[(4-hydroxy-3-iodophenyl)methylidene]-5-oxo-4,5-dihydro-1h-imidazol-1-yl}acetic acid 0.750 20 M3V {(4z)-2-[(1r,2r)-1-amino-2-hydroxypropyl]-4-[(4-cyanophenyl)methylidene]-5-oxo-4,5-dihydro-1h-imidazol-1-yl}acetic acid 0.750 21 MFC 5-[1-(3-fluoro-4-hydroxy-phenyl)-meth-(z)-ylidene]-3,5-dihydro-imidazol-4-one 0.750 22 MFV {(4z)-2-[(1r,2r)-1-amino-2-hydroxypropyl]-4-[(4-hydroxy-3-methylphenyl)methylidene]-5-oxo-4,5-dihydro-1h-imidazol-1-yl}acetic acid 0.750 23 GYS [(4z)-2-(1-amino-2-hydroxyethyl)-4-(4-hydroxybenzylidene)-5-oxo-4,5-dihydro-1h-imidazol-1-yl]acetic acid 0.741 24 CSH [2-(2-hydroxy-1-methyl-ethyl)-4-(1h-imidazol-4-ylmethyl)-5-oxo-imidazolidin-1-yl]-acetic acid 0.731 25 IIC 4-imidazolmethylene-5-imidazolone chromophore 0.731 26 X9Q {(2s)-2-[(1s)-1-aminoethyl]-4-benzyl-5-oxo-2,5-dihydro-1h-imidazol-1-yl}acetic acid 0.731 27 4NU {(4z)-2-[(1r,2r)-1-amino-2-hydroxypropyl]-4-[(3,5-dichloro-4-oxocyclohexa-2,5-dien-1-yl)methylidene]-5-oxo-4,5-dihydro-1h-imidazol-1-yl}acetic acid 0.724 28 CQ1 [(4z)-2-[(1r,2r)-1-amino-2-hydroxypropyl]-4-(4-azidobenzylidene)-5-oxo-4,5-dihydro-1h-imidazol-1-yl]acetic acid 0.724 29 GMO {(4z)-2-[(1r,2r)-1-amino-2-hydroxypropyl]-4-[(4-nitrophenyl)methylidene]-5-oxo-4,5-dihydro-1h-imidazol-1-yl}acetic acid 0.724 30 MHY {(4z)-2-[(1r,2r)-1-amino-2-hydroxypropyl]-4-[(3,5-difluoro-4-hydroxyphenyl)methylidene]-5-oxo-4,5-dihydro-1h-imidazol-1-yl}acetic acid 0.724 31 MJ1 {(4z)-2-[(1r,2r)-1-amino-2-hydroxypropyl]-4-[(2,3-difluoro-4-hydroxyphenyl)methylidene]-5-oxo-4,5-dihydro-1h-imidazol-1-yl}acetic acid 0.724 32 QCD {(4z)-2-[(1r,2r)-1-amino-2-hydroxypropyl]-4-[(4-hydroxy-3-methoxyphenyl)methylidene]-5-oxo-4,5-dihydro-1h-imidazol-1-yl }acetic acid 0.724 33 A1BE5 {(4e)-2-[(1s)-1-aminoethyl]-4-[(4-hydroxyphenyl)methylidene]-5-oxo-4,5-dihydro-1h-imidazol-1-yl}acetic acid 0.704 34 PIA [(4z)-2-[(1s)-1-aminoethyl]-4-(4-hydroxybenzylidene)-5-oxo-4,5-dihydro-1h-imidazol-1-yl]acetic acid 0.704 35 XYG [(4z)-2-[(1z)-ethanimidoyl]-4-(4-hydroxybenzylidene)-5-oxo-4,5-dihydro-1h-imidazol-1-yl]acetic acid 0.704 36 QC4 {(4z)-2-[(1r,2r)-1-amino-2-hydroxypropyl]-5-oxo-4-[(2,3,5-trifluoro-4-hydroxyphenyl)methylidene]-4,5-dihydro-1h-imidazol-1-yl}acetic acid 0.700 37 QCA {(4z)-2-[(1r,2r)-1-amino-2-hydroxypropyl]-4-[(4-hydroxy-3-nitrophenyl)methylidene]-5-oxo-4,5-dihydro-1h-imidazol-1-yl}acetic acid 0.700