You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule [(4R)-6-(4-chlorophenyl)-1,8-dimethyl-4H-[1,2,4]triazolo[4,3-a][1,4]benzodiazepin-4-yl]methyl N,N-dimethylsulfamate into molecular formula.
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C21H22ClN5O3S
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