Using CC1Cc2c(c(-c3ccccc3)c3c(c2-c2ccccc2)CCC3)C1=O to produce CC1=Cc2c(c(-c3ccccc3)c3c(c2-c2ccccc2)CCC3)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.