Using C=C(c1ccc(OCc2ccccc2)cc1)[Sn](CCCC)(CCCC)CCCC to produce C=C(C(=C)c1ccc(OCc2ccccc2)cc1)c1ccc(OCc2ccccc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.