gonane

gon·ane

(gon'ān),
The hypothetic parent (17-carbon) hydrocarbon molecule of gonadal steroid hormones, such as estrane or androstane, which was conceived to achieve forms of systematic nomenclature.
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This result showed one of the noncontraceptive benefits which might be due to lower estrogen (EE) dose, the effect of decreasing HFI and probably the minimal androgenic effect of DSG among gonane subgroups within the 19-nortestosterone group of progestogens.
* Breakthrough bleeding may be due to progestin type; switching from an estrane to a gonane may reduce it
(46) An OC with a gonane rather than an estrane progestin may be beneficial as this class of progestins may provide more consistent hormonal effects on the endometrium.
The 2 most common contraceptive progestins are derived from 19-nortestosterone, and are classified as gonanes or estranes.
Gonanes include levonorgestrel, norgestrel, desogestrel, gestodene, and norgestimate.