carotenes

https://doi.org/10.1351/goldbook.C00857
@H02889@ (a subclass of tetraterpenes).
See also:
terpenes
Source:
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1326 [Terms] [Paper]