The Chemical Constituents from the Aril of Cassia Fistula L.

Twenty‐seven compounds including eight long‐chain hydrocarbons, 1‐hexacosanol ( 1), 1 ‐octacosanol ( 2 ), palmitic acid ( 3 ), stearic acid ( 4 ), oleic acid ( 5 ), linoleic acid ( 6 ), heptacosyl eicosanate ( 7 ), glyceryl‐1‐tetraeicosanoate ( 8 ); three sterols, β‐sitosterol ( 24 ), stigmasterol ( 25 ), β‐sitosteryl‐3‐ O ‐D‐glucopyranoside ( 26 ); one triterpene, lupeol ( 27 ); eight anthraquinones, chrysophanol ( 9 ), emodin ( 10 ), physcion ( 11 ), citreorosein ( 12 ), rhein ( 13 ), rhein methyl ester ( 14 ), ziganein ( 15 ), 1,4,5‐trihydroxyanthraquinone ( 16 ); two coumarins, isoscopoletin ( 17 ), scopoletin ( 18 ); two chromones, 2,5‐dimethyl‐7‐hydroxychromone ( 19 ), 2,5‐dimethyl‐7‐methoxychromone ( 20 ); three aromatic compounds, isovanillic acid ( 21 ), vanillic acid ( 22 ), and 2,4‐dihydroxybenzaldehyde ( 23 ), were isolated and identified from the bark of Cassiafistula . Their structures were determined on the basis of spectral data.