Using O=C(OC(Cl)(Cl)Cl)OC(Cl)(Cl)Cl, Nc1ccc(N(CCCl)CCCl)cc1 to produce O=C=Nc1ccc(N(CCCl)CCCl)cc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.