1 CFY [(4z)-2-{(2r)-2-[(1s)-1-amino-2-phenylethyl]-2-hydroxy-2,5-dihydro-1,3-thiazol-4-yl}-4-(4-hydroxybenzylidene)-5-oxo-4,5-dihydro-1h-imidazol-1-yl]acetic acid 1.000 2 OFM [(4z)-2-{(2r,5r)-2-[(1s)-1-amino-2-phenylethyl]-2-hydroxy-5-methyl-2,5-dihydro-1,3-oxazol-4-yl}-4-(4-hydroxybenzylidene )-5-oxo-4,5-dihydro-1h-imidazol-1-yl]acetic acid 0.914