The following Diels-Alder reaction product is an intermediate in the synthesis of estrone. Provide the structure of the product. 
Definitions:
Net Operating Income
The income derived from a firm's core business operations, indicating the financial health of the business's day-to-day activities.
Advertising Budget
The allocation of funds towards promotional activities intended to build brand awareness, increase product demand, or communicate information to consumers.
Monthly Sales
The total revenue generated from sales activities in one calendar month, often used to track business performance.
Net Operating Income
A company's revenue minus its operating expenses, not including taxes and interest, reflecting the profit generated from regular business operations.
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