Using BrCCCCCCOc1nc2ccccc2s1, O=C1NCCN1c1cccnc1 to produce O=C1N(CCCCCCOc2nc3ccccc3s2)CCN1c1cccnc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.