You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance (2S)-N-[2-(2-bromo-4,5-dimethoxyphenyl)ethyl]-1-(thiophene-2-carbonyl)pyrrolidine-2-carboxamide .
user
C20H23BrN2O4S
assistant