Isolation of Feeding Stimulants of Brazilian Leaf Beetles (Diabrotica speciosa and Cerotoma arcuata) from the Root ofCeratosantheshilariana

Cytotoxic and Anti-HIV Principles from the Rhizomes of Begonia nantoensis

“…18,19) Fraction 4 was chromatographed on silica gel column with a gradient of i-Pr 2 O-MeOH (49 : 1 to pure MeOH) to give 2-(2-hydroxytricosanoylamino)-1,3,4-hexadecanetriol (28 mg), 20) methylparaben (1 mg), 21) p-hydroxybenzaldehyde (4 mg), 21) and trans-docosanylferulate (15 mg). 22) Fraction 5, on repeated chromatography on silica gel column with a gradient of i-Pr 2 O-MeOH (49 : 1 to pure MeOH) afforded cucurbitacin B (4, 60 mg), 23) dihydrocucurbitacin B (5, 5 mg), 24) cucurbitacin E (6, 18 mg), 4) dihydrocucurbitacin E (7, 4 mg), 23) cucurbitacin I (8, 3 mg), 4) dihydrocucurbitacin I (1 mg), 4) 3b,22a-dihydroxyolean-12-en-29-oic acid (10, 5 mg), 25) indole-3-carboxaldehyde (15 mg), 26) indole-3-carboxylic acid (11, 4 mg), 27) 5,7-dihydroxychromone (12, 4 mg), 28) (S)-N-(1-hydroxymethyl-2-phenylethyl)-benzamide (5 mg), 29) vanillic acid (4 mg), 9) piperonylic acid (1 mg), 30) benzoic acid (20 mg), 31) and caffeic acid (2 mg). 15) The concentrated EtOAc layer (16 g) was subjected to column chromatography over silica gel and eluted with a gradient of i-Pr 2 O-MeOH (5 : 1 to pure MeOH) to give nine fractions.…”