Studies on the Constituents of the Seeds of Cassia obtusifolia L. II. The Structure of Obtusin, Chryso-obtusin, and Aurantio-obtusin
1960 Volume 8 Issue 3 Pages 246-251
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1960 Volume 8 Issue 3 Pages 246-251
From the seeds of Cassia obtusifolia L. (Leguminosae), three new anthraquinone pigments, obtusin (m.p.242∼243°), chryso-obtusin (m.p.214∼215°) and aurantio-obtusin (m.p.265∼266°), were isolated. The structures of these pigments were established respectively as 1, 6, 7-trimethoxy-2, 8-dihyroxy-3-methylanthraquinone, 1, 6, 7, 8-tetramethoxy-2-hydroxy-3-methylanthraquinone, and 1, 7-dimethoxy-2, 6, 8-trihydroxy-3-methylanthra-quinone.
