You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (7R)-9-(2,4-dimethoxyphenyl)-1,7-dimethyl-3-[(2-methylphenyl)methyl]-7,8-dihydro-6H-purino[7,8-a]pyrimidine-2,4-dione .
user
C26H29N5O4
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