You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[3-[(E)-[3-(4-nitroanilino)-4-oxo-2-sulfanylidene-1,3-thiazolidin-5-ylidene]methyl]phenoxy]acetic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H13N3O6S2
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