1 BF6 [(4z)-2-(aminomethyl)-4-{[4-(benzenecarbonyl)phenyl]methylidene}-5-oxo-4,5-dihydro-1h-imidazol-1-yl]acetic acid 1.000 2 BF9 [(4z)-2-[(1r,2s)-1-amino-2-hydroxypropyl]-4-{[4-(benzenecarbonyl)phenyl]methylidene}-5-oxo-4,5-dihydro-1h-imidazol-1-yl]acetic acid 0.900