Using CCC(=O)C1=C(O)CC(c2c(C)cc(C)c(OC)c2C)CC1=O, CCON to produce CCON=C(CC)C1=C(O)CC(c2c(C)cc(C)c(OC)c2C)CC1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.