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Two new naphthopyrones, cassiasides B2 (1) and C2 (2), were isolated from the seeds (Cassiae Semen) of Cassia obtusifolia L. The structures of the two new compounds 1 and 2 were established as rubrofusarin 6-O-beta-D- glucopyranosyl-(1--&gt;6)-O-beta-D-glucopyranosyl-(1--&gt;3)-O-beta-D- glucopyranosyl-(1--&gt;6)-O-beta-D-glucopyranoside and toralactone 9-O-beta-D-glucopyranosyl-(1--&gt;6)-O-beta-D-glucopyranosyl- (1--&gt;3)-O-beta-D-glucopyranosyl-(1--&gt;6)-O-beta-D-glucopyranoside, respectively, on the basis of spectral and chemical evidence. Compound 2 was found to inhibit the histamine release from rat peritoneal exudate mast cells induced by antigen-antibody reaction.

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Antiallergic Agent from Natural Sources. Structures and Inhibitory Effect of Histamine Release of Naphthopyrone Glycosides from Seeds of Cassia obtusifolia L.