Using COc1ccccc1N1CCNCC1, O=C1CCN(Cc2ccccc2)CC1 to produce COc1ccccc1N1CCN(C2CCN(Cc3ccccc3)CC2)CC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.