You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-O-ethyl 6-O-methyl (4S,6S,7R)-4-(2,4-dichlorophenyl)-2,7-dimethyl-5-oxo-4,6,7,8-tetrahydro-1H-quinoline-3,6-dicarboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H23Cl2NO5
assistant