2-Hydroxyethanesulfonate (2-Hydroxyethanesulfonic acid or isethionic acid) is an organosulfur compound containing a short chain alkane sulfonate linked to a hydroxyl group. Mammals are able to endogenously synthesize 2-hydroxyethanesulfonate via taurine through a possible enzymatic deamination process.

Gosferol is a furocoumarin from the roots of Prangos ferulacea.

Malonic acid (propanedioic acid) is the archetypal example of a competitive inhibitor: it acts against succinate dehydrogenase (complex II) in the respiratory electron transport chain. Malonic acid is found to be associated with malonyl-CoA decarboxylase deficiency which is an inborn error of metabolism.