Vinzolidine (also known as LY104208), a semisynthetic vinblastine derivative that was developed as an antitumor agent. Vinzolidine participated in clinical trials phase II in the oral formulation in patients with lymphoma, particularly Hodgkin's disease. In addition, it was studied in patients with Kaposi's sarcoma, non-small cell lung cancer, colorectal cancer, and breast cancer. It was found significant side effects included neurotoxicity and dose-related myelosuppression. As a result, was suggested intravenous route of administration for vinzolidine could be more safely. However, the phase I trial of intravenous vinzolidine was shown no antitumor activity. The further development of this drug was discontinued.

Hexacyprone has been used as a choleretic agent. Information about the current use of this compound is not available.

Gemazocine is an opioid antagonist. It was first reported in the literature in the 1970’s, and toxicology studies have been performed to characterize its profile.

Glucosulfamide was studied as an antibacterial agent. Information about the current use of this compound is not available.

Otsuka Pharmaceutical Co developed tetomilast, a thiazole derivative for the treatment of inflammatory bowel disease and chronic obstructive pulmonary disease. Tetomilast acts as a selective inhibitor of phosphodiesterase-4 results in increased intracellular levels of cyclic adenosine monophosphate (cAMP), and subsequent anti-inflammatory effects. Specifically, the release of pro-inflammatory mediators including TNF-a and IL-12 is suppressed, and there is stimulation of the release of anti-inflammatory mediators including IL-10 and prostaglandin E2. Unfortunately, tetomilast clinical trials in patients with ulcerative colitis failed to demonstrate superior efficacy compared to mesalamine and further development of tetomilast was discontinued.

Manitimus (FK778) is a synthetic malononitrilamide (MNA) that has been demonstrated to have both both immunosuppressive and anti-proliferative activities. The MNAs inhibit both T-cell and B-cell function by blocking de novo pyrimidine synthesis, through blockade of the pivotal mitochondrial enzyme dihyroorotic acid dehydrogenase, and the inhibition of tyrosine kinase activity. It directly reduced endothelial adhesion molecule up-regulation, inhibited lymphocyte activation, and attenuated lymphocyte-endothelium interactions, critical early steps in graft rejection. Manitimus has been demonstrated to prevent acute allograft rejection in multiple experimental transplant models in rodents, dogs and primates and to be effective in the rat model of chronic renal allograft rejection. It was in clinical studies for the treatment of transplant rejection. Manitimus development has been discontinued.

Meribendan is a phosphodiesterase-III inhibitor. It exerts chrono-inodilatory response.