Thesis (M.Sc.)--Chulalongkorn University, 1996

The dried stems of Piper ribsoides Wall. Were extracted by organic solvents. The crude extracts were separated by flash column chromatography and 7 compounds were obtained. From their physical properties and spectroscopic data. These 7 compounds were identified as a methy 1-5 (3’,4’ – methylenedioxyphenyl) penta-2,4-dienoate (m.p. 141 - 143°C , C13H12O4, yellow needle), 2-(3’-hydroxy-4’-methoxyphenyl)-3methyl-5-trans-propenyl-7-methoxybenzofuran (m.p. 102-105°C, C20H20O4, white solid), 2- (3’,4’-methylenedioxphenyl)-3-methyl-5-trans-propennyl-7-methoxybenzofuran (m.p. 146-148°C, C20H18O4, white needle) , (-)-borneol p-hydroxycinnamide (m.p. 153 - 154°C, C19H24O3, white needle) , heteropeucenin-8-methyether (m.p. 105-107°C C16H18O4, yellow needle) , crotepoxide (m.p. 149 -150°C , C18H18O8, white solid) และ N-isobuty-13-(3,4-methylenedioxypheny)trideca -2,4,12 – trinamide (m.p. 116 - 117°C, C24H33NO3, white needle)