You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [2-[(5-carbamoyl-2-adamantyl)amino]-2-oxoethyl]-dimethyl-(2,4,6-trichlorophenyl)sulfonylazanium by IUPAC nomenclature, provide its molecular formula.
user
C21H27Cl3N3O4S+
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