Using Cn1c2c(c3cc(Br)ccc31)COc1ccccc1-2, O=C=O to produce Cn1c2c(c3cc(C(=O)O)ccc31)COc1ccccc1-2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.