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system
Name the molecular formula for the molecule established as [(6S)-3-cyano-2-(3-pyridin-3-ylprop-2-enoylamino)-4,5,6,7-tetrahydro-1-benzothiophen-6-yl]methyl N-ethylcarbamate using the IUPAC nomenclature.
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C21H22N4O3S
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