Using CCCC[Sn](CCCC)(CCCC)[Si](C)(C)C, COc1c(OC)c(=O)c1=O to produce CCCC[Sn](CCCC)(CCCC)c1c(OC)c(=O)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.