You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named (2E)-2-cyano-2-[(5R)-3-(3-methylphenyl)-5-[(3-methylphenyl)methyl]-4-oxo-1,3-thiazolidin-2-ylidene]acetamide is given. What is its corresponding molecular formula?
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C21H19N3O2S
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