Using O=C(c1ccccc1)N1c2cccc3c2C(CCC3N2CCOCC2)C1c1ccccc1 to produce c1ccc(C2Nc3cccc4c3C2CCC4N2CCOCC2)cc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.