Using Cc1nn2c(c1Br)CCC2, COC(=O)c1ccc(C#N)c(B2OC(C)(C)C(C)(C)O2)c1 to produce COC(=O)c1ccc(C#N)c(-c2c(C)nn3c2CCC3)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.