| Summary: | ABSTRACT
Phytochemicalinvestigations on the chloroform extract of the arial part of Orthosiphon stamineus resulted in
isolation of one new prenylated compound 5,7-dimethoxy-3,4'-dihydroxy-3:8-di-C-preny/flavanonetogether with four
known flavonoids compounds, sinensetin, eupatorin, 5,6.7,4'-tetramethoxyflavone and 3-hydroxy-5,6.7,4'-
tetramethoxyflavone.The structures were deduced on basis of different analytical methods such as UV, IR, 1H-NMR,
13C_NMR, DEPT, COSY, HMBQ and GC-MS. The prenylated compound is reported for the first time from this plant.
Keywords: Orthosiphon stamineus, prenylated flavanone, flavonoids
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