Using O=S1CCN(c2nc(Cl)nc3c(Cl)ncnc23)CC1, OCc1ccccc1 to produce O=S1CCN(c2nc(Cl)nc3c(OCc4ccccc4)ncnc23)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.