Using Cc1ccc(C2=CCC(C)(C)c3cc(Br)ccc32)cc1, C=C(OCC)[Sn](CCCC)(CCCC)CCCC to produce CC(=O)c1ccc2c(c1)C(C)(C)CC=C2c1ccc(C)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.