You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
7-[(2S)-2-hydroxy-3-(4-methoxyphenoxy)propyl]-1,3-dimethyl-8-(2-methylpropylamino)purine-2,6-dione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H29N5O5
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