1 BY0 [(1s)-2-(1-benzofuran-3-yl)-1-[[(2s)-2-methyl-3-sulfanyl-propanoyl]amino]ethyl]boronic acid 1.000 2 BX6 [(1r)-1-[[(2s)-2-methyl-3-sulfanyl-propanoyl]amino]-2-phenyl-ethyl]boronic acid 0.773 3 SRB L-1-naphthyl-2-acetamido-ethane boronic acid 0.708 4 SRD D-1-naphthyl-2-acetamido-ethane boronic acid 0.708