You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(5E)-5-[[5-bromo-2-[(4-methylphenyl)methoxy]phenyl]methylidene]-3-propan-2-yl-1,3-thiazolidine-2,4-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H20BrNO3S
assistant