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The title compound, a diterpenoid quinone isolated from Salvia ballotaeflorae Benth, crystallizes in space group P212121 with cell dimensions a= 20.991(7), b= 10.359(7) and c= 7.738(4)Å, with Z= 4. The structure was determined from diffractometer data by direct methods, and the model refined by least-squares techniques to R 0.037 for 1 331 observed reflections. The molecule contains a cyclohexane ring, a cycloheptadiene ring, a quinone moiety, and a γ-lactone. It is the first natural product of this structural type.
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Taira et al. (1976) studied this question.
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