Chemical constituents of <i>Lansium</i><i>anamallayanum</i> Bedd.

Abstract

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.