Using CCn1c(C(=O)c2cc(C)cc(C=CC#N)c2)c(C(C)C)c(=O)[nH]c1=O to produce CCn1c(C(=O)c2cc(C)cc(CCC#N)c2)c(C(C)C)c(=O)[nH]c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.