Using CCC1Cc2cc(OC(=O)c3nnn[nH]3)c(Cl)c(Cl)c2C1 to produce CCC1Cc2cc(OC(O)c3nnn[nH]3)c(Cl)c(Cl)c2C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.