You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule [(2R,3S,5R)-5-[6,8-dioxo-2-(propylamino)-1,7-dihydropurin-9-yl]-3-hydroxyoxolan-2-yl]methoxyphosphonamidous acid ?
user
C13H21N6O6P
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