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.

Delphinidin chloride, a natural plant pigment found in berries and red wine, is a precursor of certain anthocyanins.

Gizzerosine 2HCl a substance produced during the heat treatment of fishmeal, induces histopathological lesions in broiler chicks and increases intracellular cyclic adenosine-3',5'-monophosphate levels in isolated chickens of origin.