Using O=C1OC(=O)c2nc3sccc3cc21, CC(C)C(C)(N)C(N)=O to produce CC(C)C(C)(NC(=O)c1nc2sccc2cc1C(=O)O)C(N)=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.