Classify the following molecule according to its functional group. 
Definitions:
Attendance Falls
A decrease in the number of people present at an event, institution, or place compared to a previous period.
Complementary Products
Goods or services that are used together, where the use of one increases the value or demand for the other.
Good Substitutes
Products or services that can replace each other in use, offering consumers alternatives that fulfill the same need or function.
Price Elasticity
An indicator of the variation in the amount of a product desired by consumers as its cost fluctuates.
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