You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 2-(3,4-difluorophenyl)-N-[2-[ethyl(methyl)amino]-6-[(4-fluorophenyl)methylamino]pyridin-3-yl]acetamide is given. What is its corresponding molecular formula?
user
C23H23F3N4O
assistant