8-Hydroxyquinoline is an organic compound with the formula C9H7NO. It is a derivative of the heterocycle quinoline by placement of an OH group on carbon number 8. This colorless compound is widely used commercially, although under a variety of names.

Diiodohydroxyquinoline (inn) or iodoquinol (usan), widely known by the trade name diodoquin, is a quinoline derivative which can be used in the treatment of amoebiasis

Causes severe irritation and burns. May Be harmful if swallowed. Avoid breathing vapor or dust. Use with adequate ventilation. Avoid contact with eyes, skin, and clothes. Wash thoroughly after handling. Keep container closed