You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named N-[5-(diethylamino)-1-[4-(4-methoxyphenyl)piperazin-1-yl]sulfonylpent-3-yn-2-yl]-N-hydroxyformamide is given. What is its corresponding molecular formula?
user
C21H32N4O5S
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