Which functional group is NOT present in the molecule of penicillin shown below? 
Definitions:
Property Taxes
Property taxes are levies on real estate assessed based on the property's value. They are a major source of revenue for local governments, funding public services like education and infrastructure.
Excise Tax
An excise tax is a tax imposed on the sale of specific goods and services, such as tobacco, alcohol, and gasoline, often levied at the time of purchase.
Demand Curves
Graphical representations showing the relationship between the price of a good and the quantity demanded.
Supply Curves
Supply curves graphically represent the relationship between the price of a good or service and the quantity of it that suppliers are willing to produce and sell.
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