(4-alpha,8-beta,13-beta)-13-Methyl-16-oxo-17-norkauran-18-oic acid 17-Nor-8-beta,13-beta-kauran-18-oic acid, 13-methyl-16-oxo- 17-Norkauran-18-oic acid, 13-methyl-16-oxo-, (4-alpha,8-beta,13-beta)- 27975-19-5 CCRIS 6121 Isosteviol NSC 231875