You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 6-[[[(5E,6E)-5-(1-chloroethenylimino)-6-ethylidene-3-oxo-4-propan-2-ylpiperazin-2-ylidene]amino]methyl]-N-methylpyridine-3-sulfonamide into its molecular formula.
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C18H23ClN6O3S
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