Using CCn1c(N2CCN(C(=O)OC(C)(C)C)CC2)nc2c(C#N)c(Br)c(Br)cc21 to produce CCn1c(N2CCNCC2)nc2c(C#N)c(Br)c(Br)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.