Using CCO, Cc1ccc(-c2c(CNC(=O)OC(C)(C)C)c(CC(C)C)nc3ccc(CCC(N)=O)cc23)cc1 to produce Cc1ccc(-c2c(CNC(=O)OC(C)(C)C)c(CC(C)C)nc3ccc(CCC(=O)O)cc23)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.