- A prefix which indicates a shift by one position of all single and double bonds in a conjugated polyene system. It has been applied only to carotenoids and retinoids, e.g. retro-carotenoids, retro-retinoids.
- A prefix which indicates the reverse sequence of a peptide.
Blue Book Guide, p. 32 (https://doi.org/10.1351/pac199971071327)
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1363 (https://doi.org/10.1351/pac199567081307)