Using O, NC(=O)c1ccn2cc(Cn3ccc4c(C(=O)c5c(F)cc(F)cc5F)c[nH]c4c3=O)nc2c1 to produce O=C(O)c1ccn2cc(Cn3ccc4c(C(=O)c5c(F)cc(F)cc5F)c[nH]c4c3=O)nc2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.