1 SM3 (1r)-1-(2-thienylacetylamino)-1-phenylmethylboronic acid 1.000 2 SM2 (1r)-1-(2-thienylacetylamino)-1-(3-carboxyphenyl)methylboronic acid 0.864 3 ZLI ~{N}-[(4-methylphenyl)methyl]-2-thiophen-2-yl-ethanamide 0.800 4 SM4 (1r)-1-(2-thiophen-2-yl-acetylamino)-1-(3-(2-carboxyvinyl)-phenyl) methylboronic acid 0.792