Chemical constituents of Lansiumanamallayanum Bedd.

Several triterpenoids and steroids have been isolated from Lansiumanamallayanum Bedd. The leaves yielded an unknown triterpene lansitriol and four new steroids, lansisterone E1, lansisterone Z2, lansisterol B, and lansisterol A 3. From the bark, a new triterpene lactone designated as lansilactone 4 was isolated. Structures for compounds 1, 2, 3, and 4 have been proposed as 3β,4β-dihydroxy-17(20)-trans 5α-pregna-16-one; 3β,4β-dihydroxy-17(20)-trans 5α-pregna-16-one; 24-methylene 3β,4β,7β, 20-tetrahydroxy cholest-5-ene, and 25,26,27-lanostane trisnorlactone.