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 2-butyl-6-[4-[4-(3-chloro-4-methylphenyl)-1-oxo-2,7-naphthyridin-2-yl]butyl]-4-(4-propan-2-ylphenyl)-2,7-naphthyridin-1-one ?
user
C40H41ClN4O2
assistant