Basic info here: Nandrolone undeconate
This is nandrolone, hence it is identical to nondrolone dacanoate (deca durabolin). It is the same chemical the ONLY difference is it's ester. Meaning that is has the Undecaonate ester as opposed to deca durabolin's decanoate ester. All that it means is that it's longer acting and will give you more steady blood level concentrations leading to possibly having slightly better gains. I am sorry to say but a lot of what the steroid sites say is very uneducated and some of the info is wrong. It's a good product. Remember the the first part of a chemical name is always the chemical itself, hence nondrolone and the second part is the ester.
So you know that testosterone- propionate, enanthate, cypionate and varois belnds are chemically IDENTICAL. Only difference is the release times into the bloodstream.