Leonurus japonicus Houtt., also known as yimucao in Chinese, is one of the 23 species of Leonurus genus of Lamiaceae family. Various preparations of this plant are mainly used for the treatment of cardiovascular diseases, gynaecological problems and nephritis. Chemical constituents of this genus comprise diterpenes, iridoids, phenylpropanoids, alkaloids, flavonoids, etc. This paper describes the isolation and structure elucidation of the constituents from Leonurus japonicus Houtt..
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