Using O=C(c1ccccc1)c1c(-c2ccccc2)c(O)c2ccccc2c1O to produce O=C(C1=C(c2ccccc2)C(=O)c2ccccc2C1=O)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.