Using CC(C)(C)OC(=O)N=C(N)N(C[C@H]1C[C@@H](C(=O)OC(C)(C)C)N(C(=O)OC(C)(C)C)C1)C(=O)OC(C)(C)C to produce N=C(N)NC[C@@H]1CN[C@H](C(=O)O)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.