You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule tetrasodium;[(2R,3S,4R,5R)-5-[4-(dodecanoylamino)-2-oxopyrimidin-1-yl]-4-hydroxy-2-(phosphonatooxymethyl)oxolan-3-yl] phosphate .
user
C21H33N3Na4O12P2
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