Tu Youyou (born 30 December 1930) is a Chinese pharmaceutical chemist and educator. She is best known for discovering artemisinin (also known as qinghaosu) and dihydroartemisinin, used to treat malaria, and which has saved millions of lives. Tu Youyou's discovery of artemisinin and its treatment of malaria is regarded as a significant breakthrough in 20th century tropical medicine and an important health improvement for people of tropical developing countries in South Asia, Africa, and South America.

For her work, Tu received the 2011 Lasker Award in clinical medicine and the 2015 Nobel Prize in Physiology or Medicine jointly with William C. Campbell and Satoshi Ōmura. Tu is the first Chinese Nobel laureate in physiology or medicine and the first female citizen of the People's Republic of China to receive a Nobel Prize in any category, as well as the first Chinese person to receive the Lasker Award. Tu Youyou was born and educated and carried out research exclusively in China.

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