Using C=Cc1ccncc1, O=C(c1ccccc1)N1C=CN=CCN1C(=O)c1ccccc1 to produce O=C(c1ccccc1)N1CCN(CCc2ccncc2)CCN1C(=O)c1ccccc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.