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:
Hill Interaction Matrix
A conceptual framework used to analyze or categorize interpersonal interactions or group dynamics.
Data Collection
The systematic gathering of information from various sources to address a specific question or evaluate outcomes.
Co-Leader
An individual who shares leadership responsibilities with another leader in guiding a group, organization, or initiative.
Biasing Data
The act of influencing or skewing information in a way that distorts the truth or accuracy of the data.
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