Studies of coumarins from the Chinese drug Qianhu, XXVII: structure of a new simple coumarin glycoside from Bai-Hua Qianhu, Peucedanum praeruptorum.

A new simple coumarin glycoside, named praeroside VI (1), along with six known coumarins, were isolated from an aqueous extract of Bai-Hua Qianhu, the root of Peucedanum praeruptorum DUNN. (Umbelliferae). Spectroscopic analysis and chemical studies were carried out to investigate the structure of the new coumarin, which was concluded to be 1. Additionally, two simple glycosidic coumarins and four simple nonglycosidic coumarins were identified as apiosylskimmin (2), hymexelsin (3), umbelliferone (4), scopoletin (5), isofraxidin (6) and 8-carboxy-7-hydroxy coumarin (7), respectively. This is the first reported identification of compound 7 as a constituent of plant materials.