The word "Asprin" was at one time a trademark , like Kleenex, or PEPSI, however the chemical make up of what we today call "ASPRIN" came from the inside of the bark of a tree. As missionaires noticed when the natives ate the inside bark of the tree, their pains went away. Years later the chemical compounds from this tree bark were able to be manufactured using various chemicals and it became known as 'ASPRIN'.