Which phytoconstituents act as anti-helicobacter pylori agents?

Helicobactor pylori is one of the major clinical manifestation in pathogenesis of peptic ulcer disease.

A lot of research has been put forward to find the gastro-protective and anti-ulcer potential of plants against ulcer generators.

I would like to know the phytoconstituents having applicability in irradicating the H.pylori thus treating Ulcer as a disease.