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The molecular structure of 5a-bromo-8ß,9a-dimethylhydrindane-1,4-dione (C11H15BrO2) has been confirmed using three-dimensional X-ray data collected by means of a Picker FACS-1 four-circle diffractometer. The compound crystallized in the space groupC2/c with unit cell constantsa = 26.56(5),b = 6.68(1),c = 12.32(2) Å and ß = 90.6(1) °; the density was 1.55 g cm-3 andZ = 8. Least-squares refinement of the positional and anistropic thermal parameters gave a finalR1 value of 0.083 for 793 significant reflections.