1R,3S-RSL 3 is a harmala alkaloid.

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.

Orotirelin(CG 3509), a thyrotropin-releasing hormone analog, reversed pentobarbital-induced sleep time.Orotirelin may be beneficial in animals with focal cerebral ischemia.