You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [[(2R,3S,4S,5R)-5-(6-aminopurin-9-yl)-3,4-dihydroxyoxolan-2-yl]methoxy-hydroxyphosphoryl] [(2R,3S,4S,5R)-5-(3-carbamoyl-4H-pyridin-1-yl)-3,4-dihydroxyoxolan-2-yl]methyl hydrogen phosphate by IUPAC nomenclature, provide its molecular formula.
user
C21H29N7O14P2
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