Using O=C(O)C(CCCCl)c1ccc(Br)cn1, Nc1ccc(Br)cc1 to produce O=C(Nc1ccc(Br)cc1)C(CCCCl)c1ccc(Br)cn1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.