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The crystal structure is reported of a steroid crystallizing in space group P21212b with a=21.33, b=5"91 and c= 15.20 A. Three-dimensional intensity data were collected with an automatic singlecrystal diffractometer. The structure was solved by an automated Patterson search method, assuming the conformation of a part of the molecule to be known. The structure was refined by the method of least squares to a final R value of 4"0%. Bond distances, bond angles and dihedral angles are similar to those in other steroids. The extra carbon atom involved in the cyclopropane ring is proved to be in a P position. The plane of the acetate group is approximately normal to the plane of the D ring.

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