You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-(4-chlorobenzoyl)-2-[[(1S)-1-(4-chlorophenyl)-2-methylpropyl]amino]-3-ethyl-7,8-dihydro-5H-pyrido[4,3-d]pyrimidin-4-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C26H28Cl2N4O2
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