Using CCOC(=O)c1c(NS(=O)(=O)c2ccccc2)sc(Br)c1C, OB(O)c1ccoc1 to produce CCOC(=O)c1c(NS(=O)(=O)c2ccccc2)sc(-c2ccoc2)c1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.