Certain drugs can be extracted from natural sources ... that the active ingredient was salicylic acid. This was modified by chemists into the substance we call aspirin, which is less irritating ...

Acetylsalicylic is readily available in Aspirin tablets. Chemically, it is a useful molecule. It can be converted to salicylic acid and then phenol, which is an extremely useful precursor.

Certain drugs can be extracted from natural sources ... that the active ingredient was salicylic acid. This was modified by chemists into the substance we call aspirin, which is less irritating ...