Topiramate dimer impurity

C (NS (OC[C@@H]1[C@]2 ([C@@] ([C@@]3 ([C@] (O1) (OC (C) (C) O3) [H]) [H]) (OC (C) (C) O2) [H]) [H]) (=O) =O) [C@@H]4[C@]5 ([C@@] ([C@@]6 ([C@] (O4) (OC (C) (C) O6) [H]) [H]) (OC (C) (C) O5) [H]) [H]