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A method for determining ethinylestradiol ETE and levonorgestrel LEV in mixtures by first-derivative spectrophotometry is described. For reproduction of material from all other RSC journals and books: Jump to site search.
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Jump to main content. The method was applied to the determination of both compounds in five different Spanish commercial low-dose oral contraceptives. Reproduced material should be attributed as follows: XX is the XXth reference in the list of references. Search articles by author Juan J.
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