Using O=C(NC1(CO)CCCC1)c1nn(-c2ccc(F)cc2F)c2c1C[C@H]1C[C@@H]21 to produce CC1(NC(=O)c2nn(-c3ccc(F)cc3F)c3c2C[C@H]2C[C@@H]32)CCCC1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.