You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named N-[2-(1-methylimidazol-4-yl)sulfonyl-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]pyrrol-4-yl]cyclohexanecarboxamide by IUPAC nomenclature, provide its molecular formula.
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C18H28N4O3S
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