Using Cl, COC(=O)Cc1c(C)n(-c2ncnc3cc(N)ccc23)c2ccc(OC)cc12 to produce COC(=O)Cc1c(C)n(-c2ncnc3cc(Cl)ccc23)c2ccc(OC)cc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.