Botanical name: 

This substance, formerly supposed to be identical with crude chrysophanic acid, is derived from Goa Powder, a deposit found in the cavities of the trunk of the Andira araroba, a South American tree. It is used in skin diseases in the same manner as the crude Goa powder, from which it is simply a separated material. Goa powder was employed in native medication as a remedy in skin diseases, which brought it to the attention of physicians and led to its introduction into medicine, as well as its final insertion in the Pharmacopeia.

The History of the Vegetable Drugs of the U.S.P., 1911, was written by John Uri Lloyd.