Chem. Pharm. Bull., 53(7),861-862, July 2005

Notes

A New Highly Oxygenated Pseudoguaianolide from a Collection of the Flowers of Parthenium hysterophorus

Ratna DAS,^a Madamanchi GEETHANGILI,^b Anjoy MAJHI,^b Biswanath DAS,^*,b Yerra Koteswara RAO,^c and Yew-Min TZENG^c

^a Department of Chemistry, Gurudas College; Narkeldanga Main Road, Kolkata 700054, India: ^b Organic Chemistry Division-I, Indian Institute of Chemical Technology; Hyderabad 500007, India: and ^c Institute of Biotechnology, Chaoyang University of Technology; Wufeng 413, Taiwan. * To whom correspondence should be addressed. e-mail: biswanathdas@yahoo.com

A new highly oxygenated pseudoguaianolide, 8-β-acetoxyhysterone C, along with the known compounds, parthenin, coronopilin and hysterone C, has been isolated from a collection of the flowers of Parthenium hysterophorus. The structure of the new compound was derived from the extensive studies of its spectral (mainly 1D and 2D NMR) data.

Key words Parthenium hysterophorus; pseudoguaianolide; 8-β-acetoxyhysterone C