Using CCOC(=O)c1cn2c3c(c(Br)c(F)cc3c1=O)OCC2C, [Li]c1ccccc1 to produce CCOC(=O)c1cn2c3c(c(-c4ccccc4)c(F)cc3c1=O)OCC2C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.