Using COC(=O)N[C@H](C(=O)O)C(C)C, CCOC(=O)C1CC2(CN1)CN(C(=O)OC(C)(C)C)C2 to produce CCOC(=O)C1CC2(CN(C(=O)OC(C)(C)C)C2)CN1C(=O)[C@@H](NC(=O)OC)C(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.