Using CCCCCCN1C(=O)CC(C)(C)c2cc(C(C)=O)ccc21, COC(=O)c1ccc(C=O)cc1 to produce CCCCCCN1C(=O)CC(C)(C)c2cc(C(=O)C=Cc3ccc(C(=O)O)cc3)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.