Welcome and warmest wishes! On behalf of Allied Academies , it is my great pleasure to welcome all of the participants and guests to the 10 th World Congress on Chemistry and Medicinal Chemistry - C hem istry 20 20 . Chemistry 2020 will be the 10 th in the series of successful cosponsored scientific conferences of our Societies. Founded in 1994, AAC conferences have been held every year through out the world. The theme of Chemistry 20 20 is Role of Chemistry and Medicinal Chemistry in the Global Challenges to come . As with all past congresses, C hem istry 20 20 fosters collaborations among chemical scientists to improve the quality of life throughout the world. Our outstanding technical program truly represents collaborations among scientists from at least three different c ountries. The result of such collaborations can only bring improvements in technical development and a better quality of life for all people. Chemistry 202