You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2R)-2-[(1R)-1-(2-amino-6-oxo-1H-purin-9-yl)-2-hydroxyethoxy]-4-methylpentyl] propan-2-yl hydrogen phosphate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H28N5O7P
assistant