<unk> E, also known as norethinyltestosterone<unk> , as well as 17α-ethynyl-19-nortestosterone 17β-enanthate or 17α-ethynylestr-4-en-17β-ol-3-one 17β-enanthate, is a progestin, or synthetic progestogen, of the 19-nortestosterone group, and a synthetic estrane steroid. It is the C17β<unk>  ester of norethisterone.<unk> E is a derivative of testosterone with an ethynyl group at the C17α position, the methyl group at the C19 position removed, and an<unk>  ester attached at the C17β position. In addition to testosterone, it is a combined derivative of nandrolone (19-nortestosterone) and ethisterone (17α-ethynyltestosterone). Esters related to<unk> E include norethisterone acetate and levonorgestrel butanoate.
Norethisterone enanthate
Norethisterone acetate
Nandrolone hydrogen succinate
Nandrolone phenylpropionate
Nandrolone furylpropionate
Androstanolone benzoate
Nandrolone decanoate
Nandrolone caproate