Using COC(=O)Cc1ccccc1, CC(C)(C)OC(=O)NCCCCC(=O)O to produce COC(=O)C(C(=O)CCCCNC(=O)OC(C)(C)C)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.