Using O=C(O)/C=C\C(=O)O, CC(C)(C)OC(=O)c1c(N)sc2c1CC(CN)OC2 to produce CC(C)(C)OC(=O)c1c(N)sc2c1CC(CN1C(=O)C=CC1=O)OC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.