 Isatin is a well-known natural product which can be found in plants of the genus "Isatis", in "Couroupita guianensis", and also in humans, as a metabolic derivative of adrenaline.It looks like an red-orange powder, and it is usually employed as building block for the synthesis of a wide variety of biologically active compounds including antitumorals, antivirals, anti-HIVs, and antituberculars.The isatin core is also responsible for the color of “Maya blue” and “Maya yellow” dyes.