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 1-(3-chlorophenyl)sulfonyl-N-[(3S)-pyrrolidin-3-yl]pyrrolo[3,2-c]quinolin-4-amine is given. What is its corresponding molecular formula?
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C21H19ClN4O2S
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