You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 5,7-dihydroxy-2-[4-[2-(4-propan-2-ylpiperazin-1-yl)ethyl]piperazin-1-yl]naphtho[3,2-g][1,3]benzothiazole-6,11-dione by IUPAC nomenclature, provide its molecular formula.
user
C28H33N5O4S
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