You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2R,3S,5R)-5-(4-amino-2-oxo-1,3,5-triazin-1-yl)-3-hydroxy-4-methoxyoxolan-2-yl]methyl [(2R,3S,5R)-2-(hydroxymethyl)-4-methoxy-5-(2-methyl-6-oxo-1H-purin-9-yl)oxolan-3-yl] hydrogen phosphate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H29N8O12P
assistant