Cyclic 3,20-Bis(1,2-ethanediyl acetal) 7-Bromo-pregn-5-ene-3,20-dione is an intermediate in the synthesis of 3,20-Bis(ethylenedioxy)pregna-5,7-diene (B433805), which is the 3,20-bis(ethylenedioxy) analog of Ergosterol (E599240); the most important provitamin D usually obtained from yeast that synthesize it from simple sugars such as glucose.
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