You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[[[1-(cyclopropylmethyl)-2-oxo-5,6,7,8-tetrahydroquinolin-6-yl]amino]methyl]benzonitrile The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H23N3O
assistant