Using O=c1ccc2c(C(O)CCl)ccc(OCc3ccccc3)c2[nH]1 to produce O=c1ccc2c(C3CO3)ccc(OCc3ccccc3)c2[nH]1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.