Using CI, CC(C)(C)OC(=O)NCc1ccc(C(=O)O)cc1CNC(=O)OC(C)(C)C to produce COC(=O)c1ccc(CNC(=O)OC(C)(C)C)c(CNC(=O)OC(C)(C)C)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.