You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-[(4-tert-butylphenyl)methylsulfanyl]-6-(2-methoxyethyl)-3,5,7,8-tetrahydropyrido[4,3-d]pyrimidin-4-one into its molecular formula.
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C21H29N3O2S
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