Using CC(C)(C)OC(=O)CNCCCCO, COC(=O)c1cc(Cl)c(O)c(Cl)c1O to produce COC(=O)c1cc(Cl)c(OCCCCNCC(=O)OC(C)(C)C)c(Cl)c1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.