nor-ketone XI with steroid models. Thus it was shown that di- or tri-bromination of 4α-methyldihydrotestosterone acetate leads to 2α,6β-dibromo-4-methyl-testosterone acetate, also obtainable by dibromination of 4-methyltestosterone acetate. Rotatory dispersion studies of relevant iresin and steroid model compounds demonstrate that this sesquiterpene possesses the “wrong” absoluteconfiguration as compared