You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-[4-[5-(methyliminomethyl)-2H-triazol-4-yl]phenoxy]-3,4-dihydro-1H-quinolin-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H17N5O2
assistant