Three novel non-nitrogenous cassane diterpenoids from (Guill. et Perr.) Brenan (Fabaceae).

During our research to contribute to the elucidation of the chemical composition of the root bark of , six non-nitrogenous cassane diterpenoids () were isolated and identified. Of these secondary metabolites, three have never been previously described: Cassan-13,15-dien-3-oxo-17-oic acid (), Cassan-15-en-[7,17]-γ-lactone () and 6-hydroxy-cassamic acid (). The other are known but, never isolated from the root barks of (Fabaceae): Cassan-13,15-dien-17-oic acid (), hydroxycassamic acid methyl esther () and cassamic acid ().