You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(5E)-5-[[3-methoxy-4-[(3-nitrophenyl)methoxy]phenyl]methylidene]-3-prop-2-ynyl-1,3-thiazolidine-2,4-dione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H16N2O6S
assistant