Incubation of estrone (Ia) with Fusarzum monzlaforme afforded 15n-hydroxyestrone (Ib). Incubation of estradiol (IIa) with the same microorganism provided 15n-hydroxyestradiol (IIc), while 66-hydroxyestradiol 3-methyl ether (I%) was obtained by microbial incubation of estradiol 3-methyl ether (IIb). The structure determination of these substances, obtained by enzymatic transformations, results from both chemical and nuclear magnetic resonance ...