Ciamexon (Ciamexone) is a novel immunomodulator that has shown promising results in experimental models of autoimmune disease with little demonstrated cytotoxicity.

Methyl 4-bromopyrrole-2-carboxylate is a marine derived natural products found in Lissodendoryx sp.

2-Ketobutyric acid is a product of the lysis of cystathionine. It is also one of the degradation products of threonine. It can be converted into propionyl-CoA and thus enter the citric acid cycle.