You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[5-[(E)-[3-(4-carboxyphenyl)-4-oxo-2-sulfanylidene-1,3-thiazolidin-5-ylidene]methyl]furan-2-yl]benzoic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H13NO6S2
assistant