Using O=C(Cl)OCC(Cl)(Cl)Cl, Cn1cc(Br)c(N)n1 to produce Cn1cc(Br)c(N(C(=O)OCC(Cl)(Cl)Cl)C(=O)OCC(Cl)(Cl)Cl)n1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.