Using O=C(O)c1cc(Cl)cs1, NC(=O)N1C(=O)Cc2ccc(Cl)cc21 to produce NC(=O)N1C(=O)C(C(=O)c2cc(Cl)cs2)c2ccc(Cl)cc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.