Using COC(COc1ccc2c(Nc3cnn(CC(=O)Nc4cccc(F)c4F)c3)ncnc2c1)OC to produce O=CCOc1ccc2c(Nc3cnn(CC(=O)Nc4cccc(F)c4F)c3)ncnc2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.