Using CCOC(=O)c1cnc(N2CC3=C(CN(C(=O)OC(C)(C)C)C3)C2)s1 to produce CC(C)(C)OC(=O)N1CC2=C(C1)CN(c1ncc(C(=O)O)s1)C2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.