You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named N-[4-[(4-but-2-ynoxyphenyl)sulfonylamino]-5-(hydroxyamino)-5-oxopentyl]pyridine-4-carboxamide is given. What is its corresponding molecular formula?
user
C21H24N4O6S
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