12-Dipalmitoyl-sn-glycero-3-phosphoethanolamine (DPPE) a phospholipid member of the glycerophosphonoethanolamine family is a major component in biological membranes. Studies focused on interactions between DPPE and cholesterol show that cholesterol induces condensation of DPPE monolayers in the presence of Ca2+ ions.

1-Methylhydantoin is a small molecular weight polar substance the product of degradation of creatinine by bacteria. In mammals the metabolism of 1-methylhydantoin occurs via 5-hydroxy-1-methylhydantoin. In a reported human case 1-Methylhydantoin was found as an unexpected metabolite of the intelligence-affecting substance dupracetam.

2',5'-Dideoxyadenosine is a potent and non-competitive adenylyl cyclase inhibitor via binding the P-site (IC50: 3 μM).2',5'-Dideoxyadenosine (20-150 mM), like adenosine, dependently and reversibly inhibits the positive inotropic and chronotropic effect of beta-adrenergic stimulation with isoproterenol (8-54 pmol) up to 70% and 50%, respectively.