Phosphoenolpyruvic acid monopotassium salt is involved in glycolysis and gluconeogeneis. In glycolysis PEP is metabolized by Pyruvate Kinase to yield pyruvate. In plants PEP is involved in the formation of aromatic amino acids as well as in the carbon fixation pathway.

3-Guanidinopropionic acid is a creatine analog that alters skeletal muscle energy expenditure.?It reduces cellular ATP creatine and phosphocreatine levels and stimulates AMP-activated protein kinase (AMPK) activating PPARγ coactivator 1α (PGC-1α).

Azaserine is a tumor-inhibiting antibiotic isolated from a species of Streptomyces and functions as an inhibitor of glutamine amidotransferase.