Pterocarpus marsupium, also known as Malabar kino or Indian kino, is a medium-to-large, deciduous tree that can grow up to 31 m tall. It is native to India (where it occurs in parts of the Western Ghats in the Karnataka-Kerala region and in the forests of Central India), Nepal, and Sri Lanka.

Phytochemistry

Pterocarpus marsupium contains 2,3,6-trimethyl-1,4-naphthoquinone (also called 2,3,6-trimethylnaphthalene-1,4-dione or TM-NQ), which, in vitro, is a reversible monoamine oxidase inhibitor occurring in tobacco leaf, and may cause skin, eye and respiratory irritation.