You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[4-(2,6-dimethylmorpholin-4-yl)-2-phenyl-7,8-dihydro-5H-pyrido[4,3-d]pyrimidin-6-yl]-(4-fluorophenyl)methanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C26H27FN4O2
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