You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
8-[benzyl(methyl)amino]-7-[(2R)-2-hydroxy-3-prop-2-enoxypropyl]-1,3-dimethylpurine-2,6-dione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H27N5O4
assistant