Aprepitant (APT)

Aprepitant is an antiemetic chemical compound that belongs to a class of drugs called substance P antagonists (SPA). It mediates its effect by blocking the neurokinin 1 (NK1) receptor. Aprepitant is made up of a morpholine core with two substituents attached to adjacent ring carbons. These substitute groups are trifluoromethylated phenyl ethanol and fluorophenyl group. Aprepitant also has a third substituent (triazolinone), which is joined to the morpholine ring nitrogen. This means that aprepitant is made up of three chiral centres very close together, which combine to produce an amino acetal arrangement. It also means that the empirical formula of the substance is C23H21F7N4O3. Aprepitant is an off-white crystalline solid that has a molecular weight of around 534.53. It has a very limited solubility in water. It does have a reasonably high solubility in non-polar molecules such as oils.