Using COc1cccc(S)c1, C[Si](C)(C)CCOCn1cc(Br)c2c(Cl)ncnc21 to produce COc1cccc(Sc2cn(COCC[Si](C)(C)C)c3ncnc(Cl)c23)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.