Using O=Cc1cc(-c2cccnc2F)ccc1F, COCOc1cccnc1F to produce COCOc1c(C(O)c2cc(-c3cccnc3F)ccc2F)ccnc1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.