Maganhi, Stella H.Fill, Taicia PachecoRodrigues-Fo, EdsonCaracelli, Ignez [UNESP]Zukerman-Schpector, Julio2014-05-202014-05-202009-02-01Acta Crystallographica Section E-structure Reports Online. Malden: Wiley-blackwell Publishing, Inc, v. 65, p. O221-U1228, 2009.1600-5368http://hdl.handle.net/11449/8534The title meroterpene preaustinoid A (systematic name: methyl 15-hydroxy-2,6,6,10,13,15-hexamethyl-17-methylene-7,14,16-trioxotetracyclo[11.3.1.0(2,11).0(5,10)] heptadecane-1-carboxylate), C(26)H(36)O(6), features a fused four-ring arrangement. Three rings are in different distorted chair conformations and the other is in a distorted boat conformation. The absolute configuration was established based on [alpha(D)] = -4.97 degrees (c = 1.10 g l(-1), CH(2)Cl(2)). In the crystal, the molecules are connected into supramolecular chains via O-H center dot center dot center dot O hydrogen bonds.O221-U1228engArtigo10.1107/S1600536808043481WOS:000263040700103Acesso abertoWOS000263040700103.pdf