Using CC(C)c1cc(Oc2c(Br)cc(CC(=O)O)cc2Br)nnc1Cl, CC(=O)O to produce CC(C)c1cc(Oc2c(Br)cc(CC(=O)O)cc2Br)n[nH]c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.