Atrasentan hydrochloride
Atrasentan Hydrochloride is the orally available hydrochloride salt of pyrrolidine-3-carboxylic acid with potential antineoplastic activity.  As a selective antagonist of the endothelin-A (ETA) receptor, atrasentan binds selectively to the ETA receptor, which may result in inhibition of endothelin-induced angiogenesis and tumor cell proliferation.