Using CCOC(=O)C(Cl)C(C)=O, CC(C)(C)OC(=O)NCC(N)=S to produce CCOC(=O)c1sc(CNC(=O)OC(C)(C)C)nc1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.