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From the roots of Clausena indica Oliv., a new coumarin, clausindine, has been isolated and shown to have the structure 6-(2,2-dimethylcyclopropyl)furo[3,2-g][1]benzopyran-7-one (I) mainly on spectroscopic evidence. The structure has been confirmed by a synthesis of dihydroclausindine (II). The furanoquinone, furo[3,2-g][1]benzopyran-4,7,9-trione (XII) has also been isolated from the roots of this plant.
B. S. Joshi, V. N. Kamat and D. H. Gawad, J. Chem. Soc., Perkin Trans. 1, 1974, 1561 DOI: 10.1039/P19740001561
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