You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-anilino-2-(3-methylpyridin-4-yl)-1,5,6,7-tetrahydropyrrolo[3,2-c]pyridin-4-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H18N4O
assistant