Norethynodrel, a component of the first combined oral contraceptive, has the following structure. Identify the functional groups in Norethynodrel. 
Definitions:
Debt Ratio
The proportion of a company's total debt to its total assets, indicating how much of the company's operations are financed by debt.
Equity Financing
A method of raising capital through the sale of shares in a company, providing investors ownership interests.
Debt Financing
The method of raising capital through the sale of bonds, notes, or loans, which must be repaid along with interest.
Marginal Cost
The cost of producing one additional unit of a product or service.
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