You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[3-[8-(difluoromethoxy)-3,4-dihydro-2H-quinolin-1-yl]-3-oxopropyl]-1,2,3-benzotriazin-4-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H18F2N4O3
assistant