Using CCOC(=O)c1cn2cc(-c3cccc(N(C(=O)OC(C)(C)C)C(=O)OC(C)(C)C)n3)ccc2n1 to produce CC(C)(C)OC(=O)Nc1cccc(-c2ccc3nc(C(=O)O)cn3c2)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.