Using CCCC(=O)COc1cc2c(=O)c(Cc3cccnc3)cn3c4ccc(Br)cc4c(c1)c23 to produce CCCC(O)COc1cc2c(=O)c(Cc3cccnc3)cn3c4ccc(Br)cc4c(c1)c23, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.