You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 6-(2-amino-1-ethylbenzimidazol-4-yl)-3-(2-aminoethylsulfinyl)-N'-hydrazinyl-2-sulfamoylbenzenecarboximidamide by IUPAC nomenclature, provide its molecular formula.
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C18H25N9O3S2
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