You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(5-ethyl-3-methylcyclohexen-1-yl)-N-[7-(4-phenylbenzoyl)-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-4-yl]acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C31H34N4O2
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