Using CN1CCNCC1, CC(C)(C)OC(=O)NCCc1ccc(C(=O)O)cc1 to produce CN1CCN(C(=O)c2ccc(CCNC(=O)OC(C)(C)C)cc2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.