You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(2S)-3,4-dioxo-1-phenyl-4-(2-phenylethylamino)butan-2-yl]-3-methyl-6-oxo-1H-pyridine-2-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C25H25N3O4
assistant