Using COC1=Cc2ccccc2C(=CC(=O)O)c2ccsc21, C=[N+]=[N-] to produce COC(=O)C=C1c2ccccc2C=C(OC)c2sccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.