Using COc1c(C)c(Cc2ccc(O)c(C(=O)N3CCCCC3)c2)c(OC)c(OC)c1OC, COC(=O)CBr to produce COC(=O)COc1ccc(Cc2c(C)c(OC)c(OC)c(OC)c2OC)cc1C(=O)N1CCCCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.