<unk>  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<unk> .  This light yellow compound is widely used commercially, although under a variety of names.
8-Hyydroxyquinoline
Diiodohydroxyquinoline
Clioquinol
4-Nitroquinoline 1-oxide
Tetrahydrozoline
Trichloroethylene
Tetrachloroethylene
Iodoquinol