You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-ethoxy-6-(3-methylbenzimidazol-5-yl)-8-(6-methylpyridin-3-yl)-1,6-naphthyridin-7-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C24H21N5O2
assistant