In nature (especially in organisms), there are many active substances throughout the entire life process. Indole ring compounds are very important among such natural compounds. Indole and its derivatives are by the famous German chemist Adolf von Baeyer It was first obtained by reducing isatin in 1866. For more than a century, people have discovered that indole and its derivatives exist in large quantities in natural products and medicines, and now it has been widely used in production and life.
