Using CCOC(=O)CCl, CC1CN(C(=O)OC(C)(C)C)CC(C)N1 to produce CCOC(=O)CN1C(C)CN(C(=O)OC(C)(C)C)CC1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.