Using CSc1cc2c(cc1Cl)nc(Br)n2[C@@H]1OC[C@@H](OC(C)=O)[C@@H](OC(C)=O)[C@H]1OC(C)=O to produce CSc1cc2c(cc1Cl)nc(Br)n2[C@@H]1OC[C@@H](O)[C@@H](O)[C@H]1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.