Acetyl Salicylic acid, commonly known as Aspirin, is a modified form of salicylic acid. Specifically, it is an acetylated derivative where an acetyl group (CH3CO) is bonded to the phenolic hydroxyl group. Its chemical formula is C9H8O4. This chemical alteration improves its effectiveness as a medication and lessens the stomach irritation linked to salicylic acid. Knowledge of aspirin's chemical makeup aids in understanding its medical uses, primarily as an anti-inflammatory and pain reliever.
Therefore, the correct identification is Acetyl Salicylic acid.