Using ClB(Cl)Cl, C=CCn1c(COCc2ccccc2)nc(C(C)C)c1Sc1cccc(Cl)c1 to produce C=CCn1c(CCl)nc(C(C)C)c1Sc1cccc(Cl)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.