Terpenoids Move direct to terpenoids starting with A, B, C, D, E, F, G, H to U.
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| Abietane | Ambrosane |
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| Aristolane | Atisane |
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| Beyerane | Bisabolane |
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| Bornane | Cadinane |

There are 28 possible carotene parent structures of which four are illustrated. The 28 are derived from all permutations of the seven end groups:

(see carotenoid recommendations Rule 3.2).

β,ψ-Carotene

β,γ-Carotene

ε,κ-Carotene

&epsilon,χ-Carotene
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| Caryophyllane | Cedrane |
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| Dammarane | Drimane |
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| Eremophilane | Eudesmane |
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| Fenchane | Gammacerane |
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| Germacrane | Gibbane |
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| Grayanotoxane | Guaiane |