Cyclic monoterpenoids having the iridane skeleton (1-isopropyl-2,3-di-methylcyclopentane), the traditional, but not undisputed, numbering of which is shown in the diagram.
I03253.png
Source:
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1344 (https://doi.org/10.1351/pac199567081307)