This is taken from
http://www.mesorx.com/articles/roberts/000124.htm
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DHT derivatives
I have read numerous articles which stated that Primobolan Depot and Winstrol were derivatives of DHT and are particularly bad for hair loss. Is this true? Are they derived from DHT?
In medicinal chemistry, one starts with a "lead compound" that has some activity you are interested in: for example, it acts as an androgen. Compounds which you make from that compound, but which now are different because of what you have done to it, are called derivatives of that compound. A derivative will generally differ from the parent compound in its properties.
In other words, what I am saying is that whether a steroid is a "derivative" of DHT is purely a question of historical interest: it has nothing to do with how the compound acts in the body.
Incidentally, Primobolan and Winstrol could also be called a testosterone derivatives, or androstenedione derivatives, or DHEA derivatives even. So you can see the whole thing is a moot point and anyone who bases arguments on it is just playing tricks with words.
In fact Primobolan and Winstrol act differently from DHT in that, unlike DHT, they are not converted to androstanediol. They are comparable in effect on the hair to anabolically-equivalent doses of any other synthetic except nandrolone.
Would 200mg of Primobolan Depot be harsher on scalp hair than 200mg of testosterone enanthate?
Nope. Easier.