Artemisinins are sesquiterpene lactones isolated from "Artemisia annua", a Chinese traditional medicine. One of the synthetic genes in this procedure is ADS from "Artemisia annua". "Artemisia annua" is best sown in rows. An extract from qinghao ("Artemisia annua") was effective but the results were variable. Artemisia annua has been used by Chinese herbalists in traditional Chinese medicines for 2,000 years. Artemisinin is an antimalarial lactone derived from "qinghao" (, "Artemisia annua" or sweet wormwood). "Artemisia annua" belongs to the plant family of "Asteraceae" and is an annual short-day plant. Tu Youyou discovered artemisinin in the 1970s from sweet wormwood ("Artemisia annua"). Among one of the earliest examined plants was "huanghuahao" (sweet wormwood, or scientifically, "Artemisia annua").