Studies on coumarins of a chinese drug "Qian-Hu"

Three new and four known coumarins were isolated from a Chinese drug "Zi-Hua Quian-Hu" (Shikazenko in Japanese), the root of Peucedanum decursivum Maxim. (Umbelliferae). The new compounds were proved to be 3'(S)-senecioyloxy-4'(R)-hydroxy-3',4'-dihydroxanthyletin, 3' (S)-hydroxy-4' (R)-senecioyloxy-3',4'-dihydroxanthyletin and 3'(S)-angeloyloxy-4'(R)-acetoxy-3',4'-dihydroxanthyletin. The known coumarins were identified to be decursidin, bergapten, nodakenetin and nodakenin, respectively.