The following structure was used in the synthesis of a complex natural product shown to have cytotoxic activity (Org. Lett. 2006, 5585). Show how this structure may be constructed by a Robinson annulation by indicating the necessary starting materials. 
Definitions:
Cultural Dimensions
Theoretical frameworks that describe the effects of a society's culture on the values of its members, and how these values relate to behavior.
Authority Distribution
The way power and decision-making responsibilities are allocated within an organization or societal structure.
Practices Versus Values
The comparison between what is actually done (practices) and the underlying reasons or beliefs for these actions (values).
Power Distance
A dimension of organizational culture that reflects the extent to which power is distributed unequally among levels in an organization.
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