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Under IUPAC nomenclature, a molecule named tert-butyl N-[1-[cyanomethyl-[1-(4-ethylphenyl)-2-oxo-2-(propan-2-ylamino)ethyl]amino]-1-oxo-3-sulfanylpropan-2-yl]carbamate is given. What is its corresponding molecular formula?
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C23H34N4O4S
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