Using Cc1c(-c2ccccc2)n(Cc2ccccc2)c2cc(-c3ccc(O)cc3)ccc12, COC(=O)CBr to produce COC(=O)COc1ccc(-c2ccc3c(C)c(-c4ccccc4)n(Cc4ccccc4)c3c2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.