1 PKY [4-(3-aminocarbonylphenyl)-1,2,3-triazol-1-yl]methyl-phosphonooxy-borinic acid 1.000 2 KAS 3-(1-{[hydroxy(phosphonooxy)boranyl]methyl}-1h-1,2,3-triazol-4-yl)benzoic acid 0.913 3 ERF Phosphonooxy-[(4-thiophen-3-yl-1,2,3-triazol-1-yl)methyl]borinic acid 0.739