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Steroids are lipid compounds with a perhydro-1,2 cyclopentanophenanthrene ring system, which can be classified into six groups according to the number of C-atoms. C17 gonanes; C18 oestranes, as estradiol and estrone; C19 androstanes, as testosterone and androstenedione; C21 pregnanes, as progesterone and cortisol; C24 cholanes, as the bile acids cholic acid and desoxycholic acid; and C27 cholestanes, as cholesterol. The forementioned compounds are natural hormones or precursors with exception of the cholanes. According to their function steroid hormones can be divided into estrogens, androgens, and glucocorticoids and mineralocorticoids.