Using CCOC(=O)C(=O)CBr, CC(=O)OCC1=C(C(=O)OC(c2ccccc2)c2ccccc2)N2C(=O)[C@@H](NC(N)=S)[C@H]2SC1 to produce CCOC(=O)c1csc(NC2C(=O)N3C(C(=O)OC(c4ccccc4)c4ccccc4)=CCSC23)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.