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Marker, R. E., Wagner, R. B., Ulshafer, P. R., Wittbecker, E. L., Goldsmith, D. P. J., & Ruof, C. H. (1943). Sterols. CLVII. Sapogenins. LXIX.1Isolation and Structures of Thirteen New Steroidal Sapogenins. New Sources for Known Sapogenins. Journal of the American Chemical Society, 65(6), 1199–1209. doi:10.1021/ja01246a051 
10.1021/ja01246a051