Using O=CN1CCN(CCCN2C(=O)CC(c3ccccc3)N2c2ccccc2)CC1 to produce O=C1CC(c2ccccc2)N(c2ccccc2)N1CCCN1CCNCC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.