牻牛儿科植物童氏老鹳草(Geranium thunbergii)富含鞣质,在日本长期以来作为治疗肠道疾病的药物。对该植物的早期研究分离出鞣质中的主要成分——结晶性牻牛儿素(1)。随后又发现了3种其它的脱氢并没食子鞣质——芙芦草宁(furosinin)、芙芦草素(furosin)和二脱氢牻牛儿素的存在,这些鞣质被认为是牻牛儿素的代谢物。此外,值得注意的一种并没食子鞣质——杜英素,它是牻牛儿素 Geranium thunbergii, a yak pediatric, is rich in tannin and has long been used in Japan as a treatment for intestinal diseases. Early research on this plant isolated the main component of tannins - crystalline geranin (1). Subsequently, the presence of three other dehydrogenated and inanimal neopters—furosinin, furosin, and dihydrogenated geraniol—was identified as yak. Children’s metabolites. In addition, it is worth noting that one type of eucalyptus, Du Ying Su, is a yakurin.