Using NC(=O)c1cc(Br)ccc1N, CC(C)(C)OC(=O)N1CCC(=O)CC1 to produce O=C1NC2(CCNCC2)Nc2ccc(Br)cc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.