Using CCOC(=O)C1(CCOC)CCNCC1, CC(C)(C)CCC(=O)O to produce CCOC(=O)C1(CCOC)CCN(C(=O)CCC(C)(C)C)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.