Using CCCC[Sn](CCCC)(CCCC)COC, COc1cc(C)ccc1S(=O)(=O)NC(=O)C(c1ccc2c(c1)OCO2)c1cn(C)c2cc(Br)ccc12 to produce COCc1ccc2c(C(C(=O)NS(=O)(=O)c3ccc(C)cc3OC)c3ccc4c(c3)OCO4)cn(C)c2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.