You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(2,3-dimethylphenyl)-N-methyl-5-oxo-N-(thiophen-2-ylmethyl)pyrrolidine-3-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H22N2O2S
assistant