Ivermectin B1a is the major (80%) component of commercially available ivermectin and a derivative of Avermectin B1a.

Hygric acid (N-Methyl-L-proline) is a proline analogue found in the citrus juices and the juice of bergamot.

Azetidine-2-carboxylic acid is a non proteinogenic amino acid homologue of proline found in common beets. Azetidine-2-carboxylic acid can be misincorporated into proteins in place of proline in many species including humans. It is a toxic and teratogenic agent.