You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by 2-[2-[(4-bromophenyl)methylidene]hydrazinyl]-5-(3-methoxyphenyl)-7-pyridin-3-yl-3H-pyrido[2,3-d]pyrimidin-4-one ?
user
C26H19BrN6O2
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