Geranium thunbergii (Thunberg's geranium) is a cranesbill species that is commonly known as Japanese geranium or Japanese cranesbill. It is one of the most popular folk medicines and also an official antidiarrheic drug in Japan.[1] It is called ゲンノショウコ.
Geraniin is an ellagitannin found in G. thunbergii.[1]
References
^ abLuger, P.; Weber, M.; Kashino, S.; Amakura, Y.; Yoshida, T.; Okuda, T.; Beurskens, G.; Dauter, Z. (1998). "Structure of the Tannin Geraniin Based on Conventional X-ray Data at 295 K and on Synchrotron Data at 293 and 120 K". Acta Crystallographica Section B Structural Science. 54 (5): 687–694. doi:10.1107/S0108768198000081.
