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system
Provide the molecular formula for the IUPAC named substance ethyl (3aR,4S,6aS)-4-(4-bromophenyl)-2-(4-chlorophenyl)-1,3-dioxo-4,6a-dihydro-3aH-cyclopenta[c]pyrrole-5-carboxylate .
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C22H17BrClNO4
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