(1'R)-3-(1-hydroxy-2-diethylphosphonoethyl)-pyridine-2-(N-(S)-α-1-naphthylethyl)carboxamide

5-phoshonomethyl-(5R)-5,7-dihydrofuro[3,4-b]pyridin-7-one

5-bromomethyl-5,7-dihydrofuro[3,4-b]pyridin-7-one

isopropyl 3-(bromoacetyl)pyridine-2-carboxylate