Alantolactone is a selective STAT3 inhibitor.

Lomifylline is a derivative of Xanthine (HY-W017389).

Etoposide EP Impurity O is a related impurity of etoposide formed during the hydrolysis ring-opening of the 4,6-O-ethylidene protecting group in the sugar ring or during chemical synthesis. It is one of the specified impurities for the quality control of etoposide drug substances and formulations as defined by the European Pharmacopoeia (EP).

Aloenin is a kind of natural product, has effective clearing and free radical activity, and has moderate inhibitory activity on β-secretion.

Aloin A is a natural anthraquinone glycoside with iron chelating activity.

Amentoflavone is a potent active GABA(A) negative modulator.

4,6-O-(1R)-Ethylidene-β-D-glucopyranose(Ethylidene glucose), a glucose derivative, is a competitive exofacial binding-site inhibitor on glucose transporter 1 (GLUT1).

β-D-Glucopyranose, 4,6-O-(1R)-ethylidene-, 2,3-bis(2,2-dichloroacetate) is a derivative formed by esterification of the 2,3-hydroxyl groups of 4,6-O-ethylidene-α-D-glucose with dichloroacetic acid. It is a key intermediate for glycosyl donor activation in etoposide synthesis and serves as a precursor to etoposide EP Impurity O.

β-D-Glucopyranose, 4,6-O-ethylidene-, 2,3-bis(chloroacetate), (R) is a derivative formed by esterification of the 2,3-hydroxyl groups of 4,6-O-ethylidene-α-D-glucose with chloroacetic acid. It is a key intermediate for glycosylation activation in etoposide synthesis and is commonly used in the glycosyl donor activation step in the industrial production of etoposide.

Aristolochic acid is the main component of plant extract Aristolochic acids, which are found in various herbal plants of genus Aristolochia and Asarum.

Aristololactam is a naturally occurring benzophenanthridine alkaloid.

Asiatic acid, a pentacyclic triterpene found in Centella asiatica (Centella asiatica).

Asiaticoside, a trisaccaride triterpene from Centella asiatica, suppresses TGF-β/Smad signaling through inducing Smad7 and inhibiting TGF-βRI and TGF-βRII in keloid fibroblasts.

Astilbin is a flavonoid compound and enhances NRF2 activation. Astilbin also suppresses TNF-α expression and NF-κB activation.

Aucubin is an iridoid glycoside component that acn be found in E. ulmoides.

Bavachin, a flavonoid first isolated from seeds of P. corylifolia, acts as a phytoestrogen that activates the estrogen receptors ERα and ERβ.