Steviol is an ent-kaurane diterpenoid that is 5beta,8alpha,9beta,10alpha-kaur-16-en-18-oic acid in which the hydrogen at position 13 has been replaced by a hydroxy group. It has a role as an antineoplastic agent. It is a tertiary allylic alcohol, a monocarboxylic acid, a bridged compound, an ent-kaurane diterpenoid and a tetracyclic diterpenoid. It is a conjugate acid of a steviol(1-). Steviol, a natural sweetener, it inhibits proliferation of the gastrointestinal cancer cells intensively. Steviol can treat polycystic kidney disease, it slowed cyst growth, in part, by reducing AQP2 transcription, promoted proteasome, and lysosome-mediated AQP2 degradation. Steviol can induce a significant increase in CYP3A29 expression.

Escin Ia and Isoescin IA have been traditionally used clinically as the chief active ingredients of escin, a major triterpene saponin isolated from horse chestnut (Aesculus hippocastanum) seeds for the treatment of chronic venous insufficiency, hemorrhoids, inflammation and edema.