Using COCCBr, Cc1cc(OCc2ccc(F)cc2F)c(Br)c(=O)n1Cc1cnc(CO)cn1 to produce COCCOCc1cnc(Cn2c(C)cc(OCc3ccc(F)cc3F)c(Br)c2=O)cn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.