Tridecanoic acid is a 13-carbon saturated fatty acid found in dairy products and also as a product of anaerobic biodegradation of n-hexadecane. It has been identified as a substrate of phospholipase A2.

L-Glutamic acid monosodium salt (Monosodium glutamate) is an activator of mGlu1 receptor.

Setmelanotide TFA (RM-493 TFA; BIM-22493 TFA; IRC-022493 TFA) is a selective melanocortin 4 receptor (MC4R) agonist.