Acetylene Norethindrone

In vitro, incubation of norethindrone with rat hepatic microsomes resulted in only one norethindrone-derived green pigment. In vivo, however, several green pigments associated with this and other acetylenic drugs were observed, depending on the time that elapsed since... 

Oral contraceptives, sometimes called the pill, have structures similar to that of progesterone. An example is the acetylenic alcohol norethindrone, which prevents conception. On the other hand, RU 486, which also resembles progesterone, is a con-tragestive. It interferes with gestation of a fertilized ovum and, if taken in conjunction with prostaglandins, terminates a pregnancy within the first nine weeks of gestation... 

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