Answer: International Union of Pure and Applied Chemistry.
The International Union of Pure and Applied Chemistry (IUPAC) is an international non-governmental organization designed to address the problems or issues concerning chemical science around the world.
The primary goal of an IUPAC is to promote global cooperation in the chemical sciences. In order to achieve this, it is essential that chemists across the world should use a common language. IUPAC is a well-known authority for chemical compound nomenclature and many other important evaluated data.