Fig. 1

Example phytocoumarins present in chamomile and their structural relationship to warfarin. Shown are the structures for two coumarin compounds prevalent in chamomile flowers (herniarin and umbelliferone), along with the parent structural compound, coumarin. The well-known anticoagulant derivative of coumarin, warfarin (absent in chamomile), is also shown to illustrate structural analogy to the example phytocoumarins