Using BrCC1CO1, O=c1[nH]c2cc(O)ccc2c2oc3ccccc3c12 to produce O=c1[nH]c2cc(OCC3CO3)ccc2c2oc3ccccc3c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.