Using OCCn1cc(-c2ccc3c(c2)OCCc2sc(-c4ncnn4CC(F)(F)F)nc2-3)cn1 to produce O=CCn1cc(-c2ccc3c(c2)OCCc2sc(-c4ncnn4CC(F)(F)F)nc2-3)cn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.