1 BX6 [(1r)-1-[[(2s)-2-methyl-3-sulfanyl-propanoyl]amino]-2-phenyl-ethyl]boronic acid 1.000 2 BY0 [(1s)-2-(1-benzofuran-3-yl)-1-[[(2s)-2-methyl-3-sulfanyl-propanoyl]amino]ethyl]boronic acid 0.773 3 V35 D-1-(4-chlorophenyl)-2-(acetamido)ethane boronic acid 0.750 4 V36 L-1-(4-chlorophenyl)-2-(acetamido)ethane boronic acid 0.750 5 BJI 1(R)-1-acetamido-2-(3-carboxyphenyl)ethyl boronic acid 0.714