Using CCCCBr, O=c1[nH]nc2c(-c3ccc(Cl)cc3)c(-c3ccc(Cl)cc3)ccn12 to produce CCCCn1nc2c(-c3ccc(Cl)cc3)c(-c3ccc(Cl)cc3)ccn2c1=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.