{[(2R,3R,4R,5R)-5-{[({[({[(2R,3S,4R,5R)-5-(3-carbamoyl-1,4-dihydropyridin-1-yl)-3,4-dihydroxytetrahydro-2-furyl]methyl}oxy)oxido(oxo)-λ5-phosphanyl]oxy}oxido(oxo)-λ5-phosphanyl)oxy]methyl}-2-(6-aminopurin-9-yl)-4-hydroxytetrahydro-3-furyl]oxy}phosphonate sodium