Using CCOC(=O)c1cn(C2CC2)c2c(F)c(Br)c(F)c(F)c2c1=O, Cc1cc([Sn](C)(C)C)cc(C)n1 to produce Cc1ccc(-c2c(F)c(F)c3c(=O)c(C(=O)O)cn(C4CC4)c3c2F)c(C)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.