A benzoquinone and a coumestan from Psoralea plicata. Nazli Rasool, Abdul Qasim Khan, Viqar Uddin Ahmad and Abdul Malik, Phytochemistry, Volume 30, Issue 8, 1991, Pages 2800-2803, doi:10.1016/0031-9422(91)85151-O
Plicatin A and B, two phenolic cinnamates from Psoralea plicata. Nazli Rasool, Abdul Qasim Khan and Abdul Malik, Phytochemistry, Volume 29, Issue 12, 1990, Pages 3979-3981, doi:10.1016/0031-9422(90)85385-S