conessine

from The Century Dictionary.

• noun A bitter principle obtained from Holarrhena (Wrightia) antidysenterica. It is a white amorphous powder. Also called wrightin.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A steroid alkaloid found in a number of plant species of the Apocynaceae family, sometimes used in herbal medicine as a treatment for amoebic dysentery.