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 [3-(cyanomethyl)-4-oxoquinazolin-2-yl]methyl 3-(4-methylsulfanylphenyl)prop-2-enoate is given. What is its corresponding molecular formula?
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C21H17N3O3S
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