Heptadecanoic acid is a fatty acid of exogenous (primarily ruminant) origin.

[Sar9,Met(O2)11]-Substance P TFA is a selective tachykinin NK1 receptor agonist.[Sar9,Met(O2)11]-Substance P and septide (10-100 pmol per rat, i.c.v.) are equipotent in increasing mean arterial blood pressure (MAP) and heart rate (HR), yet they have dissimilar time-course. Both agonists increase dose-dependently face washing and sniffing while [Sar9,Met(O2)11]-Substance P is the sole to produce grooming.

3-Methylbutanoic acid is a naturally occurring aroma compound found in Bartlett pear brandies vanilla beans rape-honey and banana.