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Name the molecular formula for the molecule established as N-(4-methyl-1,3-thiazol-2-yl)-2-oxo-2-(2,3,4,5-tetrahydro-1H-[1,4]diazepino[1,7-a]indol-11-yl)acetamide using the IUPAC nomenclature.
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C18H18N4O2S
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