You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named [3,7-bis(azetidin-1-yl)-1,9-dichlorophenothiazin-5-yl] 2,2,2-trifluoroacetate is given. What is its corresponding molecular formula?
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C20H16Cl2F3N3O2S
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