Using COC(=O)c1ccc(OC2=C3N=C4CCCCC4=C3C(Cc3ccc(Br)cc3)C=C2)o1 to produce O=C(O)c1ccc(OC2=C3N=C4CCCCC4=C3C(Cc3ccc(Br)cc3)C=C2)o1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.