Using CC(C)(C)OC(=O)CN=C=S, CC(C)(C)OC(=O)N[C@H]1CNC1=O to produce CC(C)(C)OC(=O)CNC(=S)N1C[C@H](NC(=O)OC(C)(C)C)C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.