You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule N-(5-methyl-8-morpholin-4-ylsulfonyl-[1,2,4]triazino[5,6-b]indol-3-yl)cyclohexanecarboxamide into molecular formula.
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C21H26N6O4S
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