Using Clc1ccsc1Br, CCC(CC)c1cc(C)nc2c(I)c(C)nn12 to produce CCC(CC)c1cc(C)nc2c(-c3sccc3Cl)c(C)nn12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.