Jn. Roitman et E. Wollenweber, BETA,BETA-DIMETHACRYLOPHENONES AND A CHROMANONE FROM NAMA-HISPIDUM AND N-JOHNSTONII, Phytochemistry, 33(4), 1993, pp. 936-938
A beta,beta-dimethacrylophenone and the corresponding chromanone were
isolated from the leaf resin of Nama hispidum. The leaf exudate of N.
johnstonii contains another beta,beta-dimethacrylophenone as colouring
matter.