The steroid 3~,3fl-dimethoxy-5~-oestran-17/~-ol toluene-p#sulphonate crystallizes in the space group P2a. The lattice constants are a= 16.563, b = 9"813, c = 7.889 A and/~= 90.56 °. At -170°C the intensities of 2329 significant reflexions were measured with Mo K~ radiation: the structure was solved by a combination of Patterson and direct methods. The final Rw value is 6.01%. Rings A, B and C are normal chairs, ring D is a C(13) envelope.
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