Using CC(C)(C)C(=O)c1ccc(C(=O)O)cc1, CCOC(=O)CCN to produce CCOC(=O)CCNC(=O)c1ccc(C(=O)C(C)(C)C)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.