Clogestone Acetate (AY-11440) is a steroidal progestin that was synthesized in 1964 and was investigated as a progestin-only contraceptive but was never marketed.

Lisofylline [1-(5R-hydroxyhexyl)-3,7-dimethylxanthine] is a unique metabolite of pentoxifylline. Lisofylline inhibited the generation of phosphatidic acid and free fatty acids. Lisofylline blocked the release of pro-inflammatory cytokines in oxidative tissue injury, in response to cancer chemotherapy and in experimental sepsis. Lisofylline regulates immune cell function and autoimmune response by inhibition of IL-12 signalling and cytokine production. Lisofylline may have therapeutic value in the prevention of autoimmune disorders, including Type 1 diabetes, autoimmune recurrence following islet transplantation, and in preservation of beta cell functional mass during islet isolation.

Succinobucol (also known as AGI-1067) is a probucol derivative patented by American pharmaceutical company Atherogenics, Inc as vascular protectant with antioxidant, anti-inflammatory and antiplatelet activities. In vitro, succinobucol inhibits the TNF-α induced expression of VCAM-1 and MCP-1 with little effect on intercellular adhesion molecule (ICAM)-1. In addition, succinobucol inhibits lipopolysaccharide (LPS)-induced expression of tissue factor in human monocytic cells and endothelial cells, an effect thought to be mediated independently from the nuclear factor κB pathway. Preclinical studies have shown reduced total cholesterol and low-density lipoprotein cholesterol concentrations, increased high-density lipoprotein cholesterol concentrations, decreased levels of inflammatory mediators, and reduced atheroma area with Succinobucol treatment in animal models. Unfortunately, in clinical trials, Succinobucol failed to demonstrate a strong cardioprotective effect. Undesired metabolic effects including high-density lipoprotein cholesterol-lowering have been consistently reported, and diarrhea appears to be an expected adverse effect.

Mesocarb (sydnocarb or 3-(beta-phenylisopropyl)-N-phenylcarbamoylsydnonimine) is a psychomotor stimulant N-alkylated amphetamine derivative. Mesocarb is a selective inhibitor of dopamine uptake, it potently blocks dopamine transporter. It is very likely that mesocarb is being used by drug addicts. Mesocarb is included in the World Anti-Doping Agency’s list of substances and methods that are prohibited in sports. It is used in Russia for the treatment of a variety of neuropsychiatric comorbidities.

Lersivirine (UK-453,061) is a novel second-generation non-nucleoside reverse transcriptase inhibitor (NNRTI). It binds reverse transcriptase in a distinct way leading to a unique resistance profile. Lersivirine is a second-line NNRTI, which was investigated in a Phase IIb clinical trial. Lersivirine has shown encouraging virologic efficacy in a Phase IIa monotherapy study in NNRTI-naive patients. In a Phase IIb clinical trial in ART naive patients, clinical efficacy of lersivirine was compared with efavirenz, each administered together with tenofovir disoproxil fumarate/emtricitabine. After 48 weeks, lersivirine exhibited a slightly lower virologic response but similar immunologic efficacy. However, the trial was not powered for formal hypothesis testing of noninferiority of lersivirine. The development of lersivirine was recently stopped because the developing company determined that the compound would not provide an improvement over existing NNRTIs.

Nepicastat (SYN-117) is a potent and selective inhibitor of dopamine-β-hydroxylase. This compound in Phase 2 of clinical trial for the treatment cocaine addiction and posttraumatic stress disorder.

Ravuconazole is a triazole with antifungal properties that inhibits cytochrome P450 sterol 14a-demethylase, an enzyme involved in sterol synthesis, resulting in lysis of the fungal cell wall and fungal cell death. It was investigated for the treatment of aspergillosis, candidiasis, and onychomycosis, but these studies were discontinued. Ravuconazole is now in phase II clinical trials to investigate efficacy in preventing fungal infections in patients undergoing chemotherapy and stem cell transplantation.

Taselisib (GDC-0032) is an highly selective small-molecule inhibitor of phosphatidylinositol 3-kinase (PI3K) p110-α isoform (PIK3CA). Taselisib is designed to bind to the ATP-binding pocket of PIK3CA to potentially prevent subsequent downstream signaling. Taselisib caused a strong differential growth inhibition in carcinoma cells harbored oncogenic PIK3CA mutations. In preclinical studies, taselisib induced growth inhibition in PIK3CA-mutant xenograft mouse models. Genentech (a Roche subsidiary) is developing taselib primarily for the treatment of solid tumours.

Canertinib or CI-1033 (N-[4-[N-(3-Chloro-4-fluorophenyl)amino]-7-[3-(4-morpholinyl)propoxy]quinazolin-6-yl]acrylamide) is a pan-erbB tyrosine kinase inhibitor. It selectively inhibits erbB1 (epidermal growth factor receptor), erbB2, erbB3, and erbB4 without inhibiting tyrosine kinase activity of receptors such as platelet-derived growth factor receptor, fibroblast growth factor receptor, and insulin receptor, even at high concentrations. Canertinib was under development by Pfizer Inc as a potential treatment for cancer.