Using C1CCNC1, CN1C(=O)c2cc(Cl)ccc2N(C(=O)CCCl)c2ccccc21 to produce CN1C(=O)c2cc(Cl)ccc2N(C(=O)CCN2CCCC2)c2ccccc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.