Using COC(=O)CCNC(=O)C1CCCNC1, CC(C)(C)OC(=O)N1CCC(CCC(=O)O)CC1 to produce COC(=O)CCNC(=O)C1CCCN(C(=O)CCC2CCN(C(=O)OC(C)(C)C)CC2)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.