You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (4R)-2-methyl-4-(3-nitrophenyl)-5-oxo-N-pyridin-3-yl-4,6,7,8-tetrahydro-1H-quinoline-3-carboxamide .
user
C22H20N4O4
assistant