You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named ethyl (4S)-2,7,7-trimethyl-5-oxo-4-pyridin-3-yl-1,4,6,8-tetrahydroquinoline-3-carboxylate is given. What is its corresponding molecular formula?
user
C20H24N2O3
assistant