Using O=C1Nc2cccnc2N(C(=O)CCN2CCNCC2)c2ccccc21, BrCc1ccccc1 to produce O=C1Nc2cccnc2N(C(=O)CCN2CCN(Cc3ccccc3)CC2)c2ccccc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.