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The International Union of Pure and Applied Chemistry (IUPAC) is an international non-governmental organization that unites chemists around the world. It was founded in 1919 and has its headquarters in Geneva, Switzerland. The IUPAC's mission is to promote the development of chemistry and its applications, to advance the chemical sciences, and to enhance the professional status of chemists. Hinshelwood was the president of the IUPAC from 1951 to 1957.