See: Aplin, R.T., Hui, W.H., Ho, C.T. and Yee, C.W. (1971) An examination of the rubiaceae of Hong Kong. Part VIII. The structure of spinosic acid A, a new triterpenoid sapogenin from Randia spinosa (Thunb.) Poir. J. Chem. Soc. C, 1067-1069. [DOI:10.1039/J39710001067]