6-Hydroxyindole is a reactant for asymmetrical synthesis of notoamide J as a potential biosynthetic precursor of prenylated indole alkaloids and for preparation of indoleoxyacetic acid derivatives as peroxisome proliferator-activated receptor agonists.

Stains-All is a cationic dye of carbocyanine.

Safflower yellow is extracted from the flowers of the plant safflower (Carthamus tinctorius) and as the traditional Chinese medicine it has been extensively used for the treatment of cardio cerebrovascular diseases.