Salclobuzate sodium was developed as an oral absorption promoter. This compound had to “chaperone” poorly permeable payloads across the intestine. Information about the current use of this compound is not available.

3,5-Diiodothyropropionic acid (DITPA), a carboxylic acid analog with low metabolic activity, was observed to induce alpha-MHC mRNA in heart cell culture with EC50 approximately 5 x 10(-7) M. Zarion Pharmaceuticals was developing DITPA (3,5-diiodothyropropionic acid), a thyroid hormone analogue, for the treatment of Allan-Herndon-Dudley syndrome. In May 2013, the US FDA granted DITPA orphan drug status for the treatment of Allan-Herndon-Dudley syndrome. However, development of DITPA for the treatment of Allan-Herndon-Dudley syndrome was discontinued.

Bensuldazic acid was used in veterinary as an antifungal agent.

Kynurenic acid is a product of the normal metabolism of amino acid L-tryptophan which has been shown to have a neuroactive profile. It exhibits activity against NMDA receptors and Neuronal acetylcholine receptor subunit alpha-7. It has been investigated as a potential therapeutic compound and as a biomarker in a number of neurological disorders. Although Kenyruic acid exhibits a poor penetration of the blood-brain barrier, it remains to be of particular interest to those researching Schizophrenia.

Furacrinic acid (also known as GP 48 674) was studied as a diuretic agent and participated in clinical trials. However, information about the further development of this drug is not available.

Amfonelic acid (AFA) is a dopamine reuptake inhibitor. Experiments on rats have shown that AFA treatment completely prevented the effects of methamphetamine on the dopaminergic system, both morphologically and biochemically.

Iosefamic Acid is triiodoisophthalamic acid derivative patented by Mallinckrodt Chemical Works as x-ray contrast agent for imaging in the biliary and urinary systems and in vasography.

Thyropropic Acid (also known as Triopron) is a hydrocinnamic acid derivative and naturally occurring thyroid analog with antigoitrogenic and anticholesteremic activity. Thyropropic Acid acts as potent antagonist of thyroid hormone receptors and may be useful in the therapy of resistance to thyroid hormone and corticosteroid-induced skin atrophy. In preclinical models, Thyropropic Acid reduced serum cholesterol 27% and liver incorporation of acetate into cholesterol 37% but did not affect liver cholesterol levels.