<unk>  is an aromatic alpha hydroxy acid with the molecular formula C6H5CH(OH)CO2H.  It is a white crystalline solid that is soluble in water and polar organic solvents.  It is a useful precursor to various drugs. Since the molecule is chiral, it exists in either of two enantiomers as well as the racemic mixture, known as paramandelic acid.
Mandelic acid
Lime 
Maleic acid
Oxamyl
Meconic acid
Aristolochic acid
Acyl
Hermaphrodite