Predict the structure of each product (A-D) for the following reaction sequence. 
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Network Effect
The effect where a good or service becomes more valuable as the number of users or participants grows.
Social Media Engagement
The measure of how people interact with content on social media platforms through likes, shares, comments, and other forms of communication.
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Interact
To act in such a way as to have an effect on another; the process of two or more entities or individuals acting upon one another.
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Q144: Provide the reagents necessary to carry out