Quassinoids from the leaves of the Madagascan Simaroubaceae Samadera madagascariensis

The leaves of Samadera madagascariensis have yielded three C18 quassinoids, 5β,6-dihydrosamaderine A, 2-chlorosamaderine A, and samaderolactone A, and a C19 quassinoid, 3,4β-dihydrosamaderine C, together with the known quassinoids samaderine A, samaderine B, and cedronin.