You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [(2S,3R,4R,5S,6S)-3,4,5-triacetyloxy-6-(9-acetyloxy-5,11-dimethyl-6H-pyrido[4,3-b]carbazol-2-ium-2-yl)oxan-2-yl]methyl acetate;bromide by IUPAC nomenclature, provide its molecular formula.
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C33H35BrN2O11
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