Çelik, İsmailAtioğlu, ZelihaAksit, HuseyinDemirtaş, İbrahimErenler, RamazanAkkurt, Mehmet2020-06-272020-06-272018ÇELİK, İ., ATİOĞLU, Z., AKŞİT, H., DEMİRTAŞ, İ., ERENLER, R., & AKKURT, M. (2018). Crystal structure and Hirshfeld surface analysis of 2 oxo 13 epi manoyl oxide isolated from Sideritis perfoliata. Acta Crystallographica Section E Crystallographic Communications, 74(5), 713–717.2056-9890https://hdl.handle.net/20.500.12695/564https://doi.org/10.1107/S2056989018005807TARAMAPUBMEDTARAMASCOPUSTARAMAWOSThe title compound, C20H32O2 (systematic name: 3-ethenyl-3,4a,7,7,10a-penta­methyl­dodeca­hydro-9H-benzo[f]chromen-9-one), was isolated from Sideritis perfoliata. In the crystal, mol­ecules pack in helical supra­molecular chains along the 21 screw axis running parallel to the a axis, bound by C—H...O hydrogen bonds. These chains are efficiently inter­locked in the other two unit-cell directions via van der Waals inter­actions. Hirshfeld surface analysis shows that van der Waals inter­actions constitute the major contribution to the inter­molecular inter­actions, with H...H contacts accounting for 86.0% of the surface.enAttribution-NonCommercial-ShareAlike 4.0 Internationalinfo:eu-repo/semantics/openAccessCrystal structureCyclo­hexane ringsTetra­hydro­pyran ringsHelical supra­molecular chainsHirshfeld surface analysisArticle74571371710.1107/S2056989018005807Q3N/A