You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 1-[(2,3-dichlorophenyl)-(5-ethylpyridin-2-yl)methyl]pyrrolidine-2-carboxylic acid is given. What is its corresponding molecular formula?
user
C19H20Cl2N2O2
assistant