Using COc1cc(OC)c2c(=O)[nH]c(-c3ccc(NC(=O)COC(C)=O)cc3)nc2c1 to produce COc1cc(OC)c2c(=O)[nH]c(-c3ccc(NC(=O)CO)cc3)nc2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.