Using Cc1cc(C)c(C2C(=O)C3C4C=CC(O4)C3C2=O)c(C)c1 to produce Cc1cc(C)c(C2C(=O)C3C4CCC(O4)C3C2=O)c(C)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.