[[(2R,3S,5R)-5-(4-amino-2-oxopyrimidin-1-yl)-3-hydroxyoxolan-2-yl]methoxy-oxidophosphoryl] phosphate [[(2R,3S,5R)-5-(4-amino-2-oxo-pyrimidin-1-yl)-3-hydroxy-tetrahydrofuran-2-yl]methoxy-oxido-phosphoryl] phosphate [[(2R,3S,5R)-5-(4-amino-2-oxo-1-pyrimidinyl)-3-hydroxy-2-tetrahydrofuranyl]methoxy-oxidophosphoryl] phosphate [[(2R,3S,5R)-5-(4-amino-2-keto-pyrimidin-1-yl)-3-hydroxy-tetrahydrofuran-2-yl]methoxy-oxido-phosphoryl] phosphate [[(2R,3S,5R)-5-(4-amino-2-oxo-pyrimidin-1-yl)-3-hydroxy-oxolan-2-yl]methoxy-oxido-phosphoryl] phosphate