Using CN1CCNCC1, O=C1C(Oc2cccnc2Br)CCN1c1ccc(Br)cc1 to produce CN1CCN(c2ncccc2OC2CCN(c3ccc(Br)cc3)C2=O)CC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.