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 (6R,7R)-3-(acetyloxymethyl)-7-[[2-[(9-nitro-6,11-dihydro-5H-benzo[a]carbazol-3-yl)oxy]acetyl]amino]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid is given. What is its corresponding molecular formula?
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C28H24N4O9S
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