1 24I (2s)-2-{[hydroxy(4-iodobenzyl)phosphoryl]methyl}pentanedioic acid 1.000 2 4QP (2r)-2-{[(R)-[(R)-amino(phenyl)methyl](hydroxy)phosphoryl]methyl}-4-methylpentanoic acid 0.783 3 4ZN (2s)-2-{[(R)-[(R)-amino(phenyl)methyl](hydroxy)phosphoryl]methyl}-4-methylpentanoic acid 0.783