Using COC(=O)[C@H](Cc1ccc(O)cc1)NC(=O)[C@H](CC(=O)OC(=O)c1ccccc1)NC(=O)OCc1ccccc1, CC(C)(C)OC(=O)NCC(=O)O to produce COC(=O)[C@H](Cc1ccc(O)cc1)NC(=O)[C@H](CC(=O)O)NC(=O)CNC(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.