Using OCCCBr, CSc1ccc(Cc2c(O[C@@H]3O[C@H](CO)[C@@H](O)[C@H](O)[C@H]3O)n[nH]c2C)cc1 to produce CSc1ccc(Cc2c(O[C@@H]3O[C@H](CO)[C@@H](O)[C@H](O)[C@H]3O)nn(CCCO)c2C)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.