Using CC1(C)OCC(CO)O1, CCCC[Sn](/C=C/CBr)(CCCC)CCCC to produce CCCC[Sn](/C=C/COCC1COC(C)(C)O1)(CCCC)CCCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.