Using O=C(O)c1ccccc1C=c1c2ccccc2c2[nH]c(=O)c3nccn3c12 to produce O=C(O)c1ccccc1CC1c2ccccc2-c2[nH]c(=O)c3nccn3c21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.