6-Hydr-oxy-7-isopropyl-1,1,4a-trimethyl-2,3,4,4a,10,10a-hexa-hydro-phenanthren-9(1H)-one.

The title compound, C(20)H(28)O(2), commonly named Sugiol, is a natural oxygenated diterpene that we have isolated for the first time from a hexane extract of the fruits of Juniperus Oxycedrus L. Its X-ray crystal structure determination confirms an abietane skeleton which was predicted by spectroscopic analysis, mainly by (1)H and (13)C NMR. The cyclo-hexane ring adopts a flattened chair conformation, while the cyclo-hexene ring adopts an envelope conformation. The mol-ecules are linked through O-H⋯O hydrogen bonds to form a zigzag chain extending parallel to the c axis.