Using COc1ccc2oc3c(c2c1Br)NC(c1csc(NC(=O)C(C)C)n1)CC3=O to produce COc1ccc2oc3c(O)cc(-c4csc(NC(=O)C(C)C)n4)nc3c2c1Br, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.