In the molecule of the title compound. C30H30Br2N4O2. the piperazine ring adopts a chair conformation. The pyrrolidine rings that are fused to the piperazine ring adopt envelope conformations (in which the N atom represents the flap). https://www.roneverhart.com/MagnaFlow-2000-Dodge-Dakota-California-Grade-CARB-Compliant-Direct-Fit-Catalytic-Converter/