Using O=C=O, CCCC/C=C\c1cc2c(cc1Br)C(C)(C)CCC2(C)C to produce CCCC/C=C\c1cc2c(cc1C(=O)O)C(C)(C)CCC2(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.