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Autor:
Samiha Roshdi, Panikos Hadjigeogiou, Stephen A. Matlin, Shahrokh Mehani, M.Amelia Prazeres, Lam Chan
Publikováno v:
Steroids. 41(3)
More than 200 samples of esters of norethisterone (17 alpha-ethynyl-17 beta-hydroxyestr-4-en-3-one) and levonorgestrel (13 beta-ethyl-17 alpha-ethynyl-17 beta-hydroxygon-4-en-3 -one) have been analysed by a combination of techniques, including high p