Cycloaddition 1 ,3-dipolar cycloadditions 6 cycloaddition 6 unclassified drug 6 Bisphosphonates 4 Nitrogen oxides 4 article 4 azide 4 azomethine ylide 4 bisphosphonates 4 bisphosphonic acid derivative 4 chemical structure 4 nitrile oxide 4 stereochemistry 4 tetraethyl vinylidenebisphosphonate 4 1 ,3-Dipolarcycloaddition 2 1 3-dipolar cycloadditions 2 1,3-dipolar cycloadditions 2 3 formylpyridine 2 Acetylcholinesterase 2 Addition reactions 2 Alzheimeŕs disease 2 Amines 2 Amino acids 2 Azomethine ylides 2 Chemical compounds 2 Cycloaddition reaction 2 Cycloadditions 2 D-glyceraldehyde 2 Diastereo-selectivity 2