Using C=C[Sn](CCCC)(CCCC)CCCC, CC(C)C1c2cc(C3CC3c3cc(Br)c4cc(C#N)ccc4c3)ccc2CCN1C to produce C=Cc1cc(C2CC2c2ccc3c(c2)C(C(C)C)N(C)CC3)cc2ccc(C#N)cc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.