1 IBP Ibuprofen 1.000 2 IZP (2r)-2-[4-(2-methylpropyl)phenyl]propanoic acid 1.000 3 8OZ 2-phenylacrylic acid 0.733 4 9RW (2~{S})-2-phenylpropanoic acid 0.733 5 GRO R-2-phenyl-proprionic acid 0.733 6 1PA 4-(carboxymethyl)-L-phenylalanine 0.722