Using CC(C)Br, COc1c(C)c(Cc2ccc(O)c(C=O)c2)c(OC)c(OC)c1OC to produce COc1c(C)c(Cc2ccc(OC(C)C)c(C=O)c2)c(OC)c(OC)c1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.