Diethyl malate is a malate ester obtained by the formal condensation of the two carboxy groups of malic acid with two molecules of ethanol respectively. It has a role as a metabolite.

Glycerol Tripropionate is mainly used in the manufacture of foodstuffs, soaps, candles and also as a solvent and plasticizer.

5-Methyl-2,3-hexanedione has a powerful oily-buttery odor with a sweet taste in aqueous solution. May be synthesized by bromination of mesityl oxide, followed by treatment of the resulting dibromide with sulfuric acid.

Pyridine is an azaarene comprising a benzene core in which one -CH group is replaced by a nitrogen atom. It is the parent compound of the class pyridines.The molecules have a hexagonal planar ring and are isoelectronic with benzene. Pyridine is an example of an aromatic heterocyclic compound, with the electrons in the carbon–carbon pi bonds and the lone pair of the nitrogen delocalized over the ring of atoms. The compound is extracted from coal tar and used as a solvent and as a raw material for organic synthesis.

2-Acetylthiophene is used in the synthesis of organoboranes as well as chalcone derivatives as anti-inflammatories.