Four new coumestans dolichosins A - D (1: -4: ) were isolated from the roots of Dolichos trilobus, together with four known compounds: isosojagol (5: ), phaseol (6: ), psoralidin (7: ), and 4″,5″-dehydroisopsoralidin (8: ). Their structures were elucidated on the basis of spectroscopic data