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system
Provide the molecular formula for the IUPAC named substance 12-ethyl-10-(2-oxo-2-pyrrolidin-1-ylethyl)-5-thia-1,10,11-triazatricyclo[6.4.0.02,6]dodeca-2(6),3,7,11-tetraen-9-one .
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C16H18N4O2S
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