You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(5Z)-5-[[3-bromo-4-[(3-fluorophenyl)methoxy]-5-methoxyphenyl]methylidene]-3-prop-2-ynyl-1,3-thiazolidine-2,4-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H15BrFNO4S
assistant