You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named ethyl (2R,3R,4S)-2-(4-methoxyphenyl)-4-pyridin-3-ylpyrrolidine-3-carboxylate is given. What is its corresponding molecular formula?
user
C19H22N2O3
assistant