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 Cassia fistula. Their structures were determined on the basis of spectral data.