Using O=C1C(=O)N(CCCN2CCN(C(c3ccccc3)(c3ccccc3)c3ccccc3)CC2)c2ccccc21 to produce O=C1C(=O)N(CCCN2CCNCC2)c2ccccc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.