Using NCCC1C(=O)Nc2ccccc21, O=C1OC(=O)c2ccccc21 to produce O=C1Nc2ccccc2C1CCN1C(=O)c2ccccc2C1=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.