You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-(3,4-dihydro-2H-1,5-benzodioxepin-7-yl)-3-[methoxy(methyl)sulfamoyl]benzamide by IUPAC nomenclature, provide its molecular formula.
user
C18H20N2O6S
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