Gangetial, a new pterocarpan from the roots of Desmodium gangeticum

Sree Vidyaniketan College of Pharmacy, A. Rangampet, Via Tirupathi-517 102, Andhra Pradesh, India

Central Research Institute for Siddha (CCRAS), Arumbakkam, Chennai-600 106, India

Department of Applied Sciences, Higher College of Technology, P.B. 74, P.C. 133, Muscat,

Sultanate of Oman

Department of Chemistry, University College of Science, 92, Acharya Prafulla Chandra Road,

Kolkata-700 009, India

E-mail : amarendra@sify.com

Manuscript received 17 October 2008, revised 10 February 2009, accepted 11 February 2009

A new pterocarpan gangetial (1) has been Isolated from the chloroform extract of the roots of the plant Desmadium gangetieum together with gangetinin. The structure of the new compound was elucidated as (5bR,10bR)-5b,10b-dihydro-8-hydroxy-5-methoxy-2,2-dimethyl-2H,11H-benzo(4,5]furo[2,3-d]pyrano(3,2-g]chromene-7-carbaldehyde based on the chemical and spectroscopic data.