Using O=C(O)C(O)C1c2ccccc2-c2[nH]c(=O)c3nccn3c21 to produce O=C(O)C=c1c2ccccc2c2[nH]c(=O)c3nccn3c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.