You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 2-[4-[4-[[2-(4-methylphenyl)benzoyl]amino]benzoyl]-2-oxo-3H-quinoxalin-1-yl]acetic acid into molecular formula.
user
C31H25N3O5
assistant