Using OB(O)c1cccs1, COc1cc(C=CC(=O)c2cc(OC)c(OC)c(OC)c2)cc(Br)c1OC to produce COc1cc(C(=O)C=Cc2cc(OC)c(OC)c(-c3cccs3)c2)cc(OC)c1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.