Using c1cncc(Cc2cccnc2)c1, O=Cc1cccnc1-c1cc(Cl)cc(Cl)c1 to produce OC(c1cccnc1-c1cc(Cl)cc(Cl)c1)C(c1cccnc1)c1cccnc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.