You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(2E)-2-[(2,6-dichlorophenyl)methylidene]hydrazinyl]-N-(4-methoxyphenyl)-5-nitrobenzenesulfonamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H16Cl2N4O5S
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