Which of the structures below corresponds to the dipeptide cysteylananine? The parent amino acids are shown below. 
Definitions:
Society's Welfare
A measure of the overall well-being and quality of life of the members of a society, often considered in economic terms but also including factors like health, education, and environmental quality.
Monopolist
An entity that is the sole provider of a particular product or service in the market, having significant control over pricing.
Deadweight Loss
A loss of economic efficiency that can occur when the free market equilibrium for a good or a service is not achieved.
Society's Welfare
The overall well-being and quality of life of the people within a society, including factors like health, happiness, and economic prosperity.
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