You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-amino-9-(3-hydroxy-1-methoxy-1-phenylmethoxypropan-2-yl)-1H-purin-6-one;hydrochloride by IUPAC nomenclature, provide its molecular formula.
user
C16H20ClN5O4
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