You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
propan-2-yl (4S)-2,7,7-trimethyl-4-(2-nitrophenyl)-5-oxo-3,4,6,8-tetrahydroquinoline-3-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H26N2O5
assistant