You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule N-[3-[(2R)-3-(4-methylphenyl)-4-oxo-1,3-thiazolidin-2-yl]phenyl]thiophene-2-carboxamide into molecular formula.
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C21H18N2O2S2
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