06005 IUPAC Gold Book - steroids 10.1351/goldbook.S06005 S06005 current 1 Naturally occurring compounds and synthetic analogues, based on the cyclopenta[a]phenanthrene carbon skeleton, partially or completely hydrogenated; there are usually methyl groups at C-10 and C-13, and often an alkyl group at C-17. By extension, one or more bond scissions, ring expansions and/or ring contractions of the skeleton may have occurred. Natural steroids are derived biogenetically from triterpenoids. alkyl group https://goldbook.iupac.org//terms/view/A00228 triterpenoids https://goldbook.iupac.org//terms/view/T06510 PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1367 (https://doi.org/10.1351/pac199567081307) White Book, 2nd ed., p. 193 (https://iupac.qmul.ac.uk/bibliog/white.html) https://goldbook.iupac.org/terms/view/S06005/html https://goldbook.iupac.org/terms/view/S06005/json https://goldbook.iupac.org/terms/view/S06005/plain Citation: 'steroids' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.S06005 The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using. 2026-05-06T16:04:04+00:00