Using CCOC(=O)CBr, O=C1CCN(c2ccc(CC3SC(=O)NC3=O)cc2)CC1 to produce CCOC(=O)CN1C(=O)SC(Cc2ccc(N3CCC(=O)CC3)cc2)C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.