Abstract
The title seco-dammarane triterpenoid, C27H42O4 (systematic name: 3-{(3S,3aR,5aR,6S,7S,9aR,9bR)-6,9a,9b-trimethyl-3-[(R)-2-methyl-5-oxotetrahydrofuran-2-yl]-7-(prop-1-en-2-yl)dodecahydro-1H-cyclopenta[a]naphthalen-6-yl}propanoic acid), has been isolated for the first time from the seeds of Aglaia forbesii. The molecule has three fused rings and all rings are in trans-fused. The two cyclohexane rings are in standard chair conformations and the cyclopentane ring adopts an envelope conformation. Its absolute configuration was determined by the refinement of the Flack parameter to 0.26 (17). In the crystal, molecules are linked into chains along [010] by O—H⋯O hydrogen bonds.
Highlights
Absolute configuration of isoeichlerialactoneUSM, Penang, Malaysia, bNatural Products Research Center, Faculty of Science, Prince of Songkla University, Hat-Yai, Songkhla 90112, Thailand, and cCrystal
Materials Research Unit, Department of Chemistry, Faculty of Science, Prince of Songkla University, Hat-Yai, Songkhla 90112, Thailand
Its absolute configuration was determined by the refinement of the Flack parameter to
Summary
USM, Penang, Malaysia, bNatural Products Research Center, Faculty of Science, Prince of Songkla University, Hat-Yai, Songkhla 90112, Thailand, and cCrystal.
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