3,4,8,9,10-Pentahydroxy-dibenzo[b,d]pyran-6-one from Tamarix nilotica

A new natural product, 3,4,8,9,10-pentahydroxy-dibenzo-[b,d]pyran-6-one was isolated from the flowers of Tamarix nilotica which also contains the known compound ellagic acid, 2,3,7,8-tetrahydroxy [1]benzopyrano[5,4,3-cde][1]benzopyran-5,10-dione. The structure of the new compound was determined by chemical and spectroscopic methods. The ¹³C MNR spectrum of ellagic acid was recorded and assigned.