IUPAC:disodium [(2R,3S,5R)-3-hydroxy-5-[5-(13C)methyl-2,4-dioxo-1,2,3,4-tetrahydro(2,4,5,6-13C4,1,3-15N2)pyrimidin-1-yl](2,3,4,5-13C4)oxolan-2-yl](13C)methyl phosphate
IUPAC:disodium [(2R,3S,5R)-3-hydroxy-5-[5-(13C)methyl-2,4-dioxo-1,2,3,4-tetrahydro(2,4,5,6-13C4,1,3-15N2)pyrimidin-1-yl](2,3,4,5-13C4)oxolan-2-yl](13C)methyl phosphate