You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (4Z)-4-[(4-bromo-3-methylphenyl)-hydroxymethylidene]-1-(2-methoxyethyl)-5-(3-methylthiophen-2-yl)pyrrolidine-2,3-dione ?
user
C20H20BrNO4S
assistant