Wiktionary
artesunate
n. (context medicine English) A drug, of the artemisinin group, used to treat malaria
Wikipedia
Artesunate
Artesunate (AS) is a medication used to treat malaria. It is water-soluble and may therefore be given by injection. It is a semi-synthetic derivative of artemisinin.
It is on the World Health Organization's List of Essential Medicines, the most important medications needed in a basic health system.