A reinvestigation of the whole plant of Andrographis echioides has led to the isolation of a new flavanone, dihydroechioidinin together with four known flavones, echioidinin, echioidin, skullcapflavone I 2'-O-methyl ether, and skullcapflavone I 2'-O-glucoside. The structure of dihydroechioidinin was established as (2S)-5,2'-dihydroxy-7-methoxyflavanone on the basis of spectral and chemical evidence.
Acanthaceae, Andrographis echioides, flavanone, dihydroechioidinin
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