Acid-hydrolysed extractives of C. occidentalis L. have furnished, in addition to emodin and physcion, known to occur in the species, two unidentified pigments, m.p. 214–216° and 243–245°, chrysophanol, α₃-sitosterol, and a new xanthone, cassiollin, identified as 1,7-dihydroxy-5-methoxycarbonyl-3-methylxanthone.