According to this invention, there is provided a novel 4,8 dimethylbicyclononane derivative represented by the formula : ##STR2## wherein one of X and Y represents a hydroxyl group, a straight or branched alkoxy group having 1 to 5 carbon atoms or {HEAD ~ an acyloxy group} having {TAIL ~ 2 or 3 carbon atoms} and the other represents a hydrogen atom, or 57 jointly represent an oxo group ; and a dotted line represents optional presence of a double bond 
According to this invention , there is provided a novel 4,8 dimethylbicyclononane derivative represented by the formula : # # STR2 # # wherein one of X and Y represents a hydroxyl group , a straight or branched alkoxy group having 1 to 5 carbon atoms or { HEAD ~ an acyloxy group } having { TAIL ~ 2 or 3 carbon atoms } and the other represents a hydrogen atom , or 57 jointly represent an oxo group ; and a dotted line represents optional presence of a double bond
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