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