Specific incorporation of l-[U-14C]phenylalanine, [U-14C]cinnamic acid and p[2-14C]coumaric acid into bakuchiol has been observed in Psoralea corylifolia. Our findings show that the aromatic moiety along with two carbon atoms of the side chain are biosynthetically derived via phenylpropane pathway and not by the alternate pathway proposed earlier.
A. Banerji and Chintalwar, G. J., “Biosynthesis of bakuchiol from cinnamic and p-coumaric acids”, Phytochemistry, vol. 23, pp. 1605–1606, 1984.