Aspalathin is a C-linked dihydrochalcone glucoside found in rooibos tea, a herbal tea prepared from the South African rooibos plant, Aspalathus linearis (Fabaceae).

D-Ala-Lys-AMCA hydrochloride, a known substrate of proton-coupled oligopeptide transporter 1 (PEPT1), emits blue fluorescence and may be transported into Caco-2 cells and liver cancer cells.

[(2E,4E)-Octadienoyl]-N-isobutylamide (compound 2) is an isobutylamide that can be isolated from pepper seeds.