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. 2020 Apr 24;412(17):4089–4099. doi: 10.1007/s00216-020-02640-6

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© The Author(s) 2020

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Scheme 1 — Chemical structures of the main steroids. Steroids are shown in groups (Cholesterol Biosynthesis, Oxysterols, Progestagens, Mineralcorticoids and Androgens) and in order of synthesis. Colours of chemical structures are identical with colours of data points in the result figures