Using CC(C)(C)OC(=O)N1CCC(N)CC1, CC(C)(C)C(=O)OCn1cc(CCCC(=O)O)nn1 to produce CC(C)(C)OC(=O)N1CCC(NC(=O)CCCc2cn(COC(=O)C(C)(C)C)nn2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.