Using Brc1cccnc1Oc1ccc(Nc2ccccn2)cc1, O=C1CCOCC1 to produce OC1(c2cccnc2Oc2ccc(Nc3ccccn3)cc2)CCOCC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.