Using Cc1cc([Sn](C)(C)C)sn1, COc1ccc2c(OCc3nnc4c(F)cc(Cl)cn34)ccnc2c1 to produce COc1ccc2c(OCc3nnc4c(F)cc(-c5cc(C)ns5)cn34)ccnc2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.