Aristolactam is an AQP1 inhibitor and Aristolochic acid I metabolite.

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.

Bavachinin is agonist of pan-peroxisome proliferator-activated receptor (PPAR).

Bergapten is inhibitory towards mouse and human CYP isoforms.

Bilobalide, a sesquiterpene trilactone constituent of Ginkgo biloba, inhibits the NMDA-induced efflux of choline.

Bisdemethoxycurcumin is a curcumin derivative.

Brucine is a weak alkaline indole alkaloid.

Linarin is an active and selective inhibitor of acetylcholinesterase (AChE).

Brucine sulfate is the sulfate salt form of brucine that induces chondrocyte proliferation by activating the Wnt/β-catenin signaling pathway.

Bufalin is an active component isolated from Chan Su, acts as a potent Na+/K+-ATPase inhibitor.

Crassicauline A is a diester-type diterpenoid alkaloid. Crassicauline A exhibits feeding deterrent activity against adult Tribolium castaneum.

Cantharidin, a natural toxin isolated from beetles in the families Meloidae and Oedemeridae, has been reported to be toxic to some pests, including the diamondback moth.