Endogenous agonist at orexin receptors (Ki values are 20 and 38 nM for OX1 and OX2 receptors respectively). Stimulates feeding following central administration and may be involved in the control of sleep-wake cycle and other hypothalamic functions.

7-Methoxy-4-methyl-coumarin-8-ol (compound 31) is a compound isolated from sour orange (Citrus aurantium).

Adenine HCl is a hydrochloride salt form of adenine which is a nucleobase with a variety of roles in biochemistry.