Halogen substituted analogs of 5-(phenylthio)ribose were synthesized a
nd tested as inhibitors of the methylthioribose kinase-containing path
ogen, Klebsiella pneumoniae. All of the compounds exhibit good activit
y against the organism. 5-(4-Iodophenylthio)ribose demonstrated the mo
st potent inhibitory effects with a 50% inhibitory concentration (IC50
) value of similar to 2.5 picomolar (0.0009 ng/ml).