<unk> , also known as 17α-ethynyl-δ5(10)-19-nortestosterone or as 17α-ethynylestr-5(10)-en-17β-ol-3-one, is a synthetic estrane steroid and a derivative of testosterone. It is specifically a derivative of testosterone that has been ethynylated at the C17α position, demethylated at the C19 position, and dehydrogenated (i.e., has a double bond) between the C5 and C10 positions). As such,<unk>  is also a combined derivative of nandrolone (19-nortestosterone) and ethisterone (17α-ethynyltestosterone). In addition, it is an isomer of norethisterone (17α-ethynyl-19-nortestosterone) in which the C4 double bond has been replaced with a double bond between the C5 and C10 positions. For this reason,<unk>  is also known as 5(10)-norethisterone. Few other 19-nortestosterone progestins share the C5(10) double bond of<unk> , but examples of a couple that do include tibolone, the C7α methyl derivative of<unk>  (i.e., 7α-methylnoretynodrel), and norgesterone, the C17α vinyl analogue of<unk> . Synthesis Chemical syntheses of<unk>  have been published.
Noretynodrel
Buffalopox
Protokylol
Tezacaftor
Oprelvekin
Prasugrel
Co-codaprin
Cangrelor