Using O=C1C(c2c[nH]c3ccccc23)=C(c2c[nH]c3ccccc23)C(=O)N1c1ccccc1 to produce O=C1C(c2c[nH]c3ccccc23)C(c2c[nH]c3ccccc23)C(=O)N1c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.