Using CCN=C=NCCCN(C)C, CC(C)(C)OC(=O)N1CC(CC(=O)O)C1 to produce CCOC(=O)CC1CN(C(=O)OC(C)(C)C)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.