Using CC(O)CC1CCNCC1, O=C(O)c1cc2ccccc2[nH]1 to produce CC(O)CC1CCN(C(=O)c2cc3ccccc3[nH]2)CC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.