Three diterpenoids closely related to andrographolide have been isolated from Andrographis paniculata Nees. These have been identified as 14-deoxy-11-oxoandrographolide (6), 14-deoxy-11,12-didehydroandrographolide (23), and 14-deoxyandrographolide (26).
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Balmain et al. (1973) studied this question.