Using ClCCI, CC(C)(O)CCn1cnc2c(N3CCOCC3)nc(Cl)nc21 to produce CC(C)(O)CCn1c(I)nc2c(N3CCOCC3)nc(Cl)nc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.