Linked from
The 5 pages that link to Acetylsalicylic acid, each with the reason it gives.
Salicylic acidCompared with: Aspirin is a derivative, not simply another name for salicylic acid.
Acetyl groupBroader topic: Its acetyl group is transferred to cyclooxygenase enzymes.
Acetic anhydrideBroader topic: Acetic anhydride is a standard acetyl donor in aspirin production.
SalicinCompared with: Unlike salicin, it is a defined drug with a direct, standardized dose.