Ziretaxestat, an oral autotaxin (ATX) inhibitor originated by Galapagos, once garnered excitement as the first molecule to complete a Ph. III clinical program in idiopathic pulmonary fibrosis since the approvals of nintedanib and pirfenidone. Following the disappointing clinical data and discontinuation of the molecule, this annotation revisits ziritaxestat in the context of other inhibitors, recaps the therapeutic hypothesis and how it was discovered, summarizes notable molecular properties for drug discovery scientists, and discusses what happened and what’s next.

Orforglipron is an oral non-peptide glucagon-like peptide-1 (GLP-1) receptor partial agonist that entered Ph. III for obesity and type-2-diabetes mellitus (T2DM). This 2020 and 2023 Molecule of the Year nominee (nominated initially back when it was still in Ph. I) was first discovered by Chugai Pharmaceuticals under the name OWL833, then licensed by Eli Lilly for worldwide development under the name LY3502970. The article discusses where it sits in the GLP-1R agonist landscape, why it’s scientifically notable, how it works with illustrations from cryo-EM structures, its synthesis, and more.

Chugai’s PCO371 is an oral, biased agonist and "molecular wedge" of the class B GPCR, PTHR1, that first entered development for hypoparathyroidism in 2015 (NCT02475616). While Class A GPCRs, which typically have compact ligandable pockets are the most common targets for approved drugs, Class B GPCRs like PTHR1, GLP-1R, and CGRP are notoriously difficult to drug since they normally bind large peptides with long transmembrane tunnels that are not easily bound by small molecules. This article explains what makes PCO371 a big deal for GPCR drug discovery.

“Compound 10” (AstraZeneca) is an oral CDK5-mediated PPARγ phosphorylation inhibitor and partial PPARγ agonist being developed as an antidiabetic drug . Although widely used PPARγ agonists such as rosiglitazone and pioglitazone are effective antidiabetics, they are limited by [...]

The recently released WHO INN proposed names list includes the structure and name of Structure Therapeutics’ oral small molecule GLP-1R agonist, aleniglipron (GSBR-1290). Seemingly emerging from a “fast-follower” program based on Chugai/Eli Lilly’s orforglipron, the compound includes an unusual phosphine oxide motif and has shown positive results on plasma glucose levels and bodyweight in a Ph. IIa study.