Estrane is a C18 steroid derivative, with a gonane core.
Estrenes are estrane derivatives that contain a double bond, with an example being nandrolone. (estrins) are estrane derivatives that contain three , for instance estrin (estra-1,3,5(10)-triene). A class of female , , such as estradiol, estrone, and estriol are estratrienes.
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