Using O=C(Cl)CN1C(=O)c2ccccc2C1=O, CN1C(=O)CCc2ccccc21 to produce CN1C(=O)CCc2cc(C(=O)CN3C(=O)c4ccccc4C3=O)ccc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.