Using COC(=O)c1cccc2c1c1c(n2Cc2cccc(Cl)c2)CCCC1=O to produce COC(=O)c1cccc2c1c1c(O)cccc1n2Cc1cccc(Cl)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.