You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-(6,7,8,9-tetrahydro-5H-pyrido[2,3-d]azepin-2-yl)-7,8-dihydro-6H-1,6-naphthyridin-5-one into its molecular formula.
user
C17H18N4O
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