Using CCOC(=O)n1c2ccccc2c(=O)n1C(c1ccccc1)c1ccccc1 to produce O=c1c2ccccc2[nH]n1C(c1ccccc1)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.