You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
propan-2-yl 2-methyl-5-oxo-4-(2-propoxyphenyl)-4a,6,7,8-tetrahydro-4H-quinoline-3-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H29NO4
assistant