You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-(5-methylhex-3-en-2-yl)-5-(4-methylpyridin-2-yl)cyclohexa-1,5-diene-1-carbonitrile The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H24N2
assistant