The compound shown below is responsible for the odor in rancid butter.Identify the functional group circled. 
Definitions:
Default Risk Premiums
The additional yield a bond issuer must pay to compensate investors for the risk that the issuer might not make payments as promised.
Yield
The yield from an investment, including interest or dividends, represented as a percentage of the cost of the investment or its present market worth.
Treasury Bond
A Treasury Bond is a long-term, fixed-interest government debt security with a maturity period typically longer than 10 years.
Roll's Critique
A criticism of the capital asset pricing model (CAPM) proposed by Richard Roll, arguing that the market portfolio is unobservable and thus the CAPM cannot be tested properly.
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