#TITLE_ALTERNATIVE#

• Main Author: Rosyidah, Kholifatu
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/6359
• Institution: Institut Teknologi Bandung

<b>Abstract</b><p align="justify"><br />Two resveratrol dimers, (-)-ampelopsin F and (-)-laevifonol and four resveratrol trimers, (°)-davidiol A, trans-miyabenol C, (+)-a-viniferin, and D274 (the structure of this compound has not yet identified), were isolated from acetone extract of the stem bark of Shores parvifolia Dyer. The structures of these compounds were determined based on their spectroscopic data including spectroscopy ultra violet (UV), infra red (IR), nuclear magnetic resonance (1H NMR, 13C NMR), 2D NMR and also were compared with the of reported data.<p align="justify"><br /><br />All of the compounds, except (-)-ampelopsin F, have heterocyclic rings trans-2,3-diaryl-2,3-dihydrobenzofuran which are common in compounds from Shorea. (-)-Ampelopsin F is an unique compound because it contains dibenzobicycio[3,2,1]octadiene ring system which has never been found in oligoresveratrols of Shorea. While the existence of trans-vinil unit on transmiyabenol C is interesting, because only few trimer resveratrols from Shorea still have this unit in their skeletons. Like wise the structure D274 compound which its structure has not yet determined conclusively, but its UV, 1R, and NMR data showed that it has a methyquinone skeleton which is also rare in oligoresveratrol compounds.<p align="justify>