Using O=c1nc(Nc2ccc(Cl)cc2)sc2ncccc12, BrCC1OCCO1 to produce O=c1c2cccnc2sc(=Nc2ccc(Cl)cc2)n1CC1OCCO1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.