Using O=C1CCN(C(=O)c2ccccc2)CC1, NC(=O)CCc1ccccc1N to produce NC(=O)CCc1ccccc1NC1CCN(C(=O)c2ccccc2)CC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.