Norpregnanes - ț̢
Pregnanes which have undergone ring contractions or are lacking carbon-18 or carbon-19. Unsaturation in the steroid ring system is not included.
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Norpregnatrienes - ț̢
Pregnatrienes which have undergone ring contractions or are lacking carbon-18 or carbon-19.
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Norpregnenes - ț̢
Pregnenes with one double bond or more than three double bonds which have undergone ring contractions or are lacking carbon-18 or carbon-19..
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Norprogesterones - ț̢
Progesterones which have undergone ring contraction or which are lacking carbon 18 or 19.
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Norsteroids - ț̢
Steroids which have undergone contraction in ring size or reduction in side chains.