A new pterocarpan gangetial (1) has been isolated from the chloroform extract of the roots of the plant Desmodium gangeticum 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.