You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 3-[5-(dimethylsulfamoyl)-1-ethylbenzimidazol-2-yl]-N-methyl-N-[2-(methylamino)ethyl]propanamide;hydrochloride by IUPAC nomenclature, provide its molecular formula.
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C18H30ClN5O3S
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