Using Fc1cccc2ncnc(Nc3ccc(OCc4ccccn4)c(Cl)c3)c12, OCCO to produce OCCOc1cccc2ncnc(Nc3ccc(OCc4ccccn4)c(Cl)c3)c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.