Using BrCC1CO1, COc1ccc(-c2coc3c(C)c(O)ccc3c2=O)cc1OC to produce COc1ccc(-c2coc3c(C)c(OCC4CO4)ccc3c2=O)cc1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.