Using Cn1c(CC2C=CN(C(=O)c3ccccc3)C=C2)nc2ccccc21 to produce Cn1c(CC2=CCN(C(=O)c3ccccc3)C=C2)nc2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.