Consider the ADH reaction and answer the following question. ADH stands for alcohol dehydrogenase. 
In the given reaction, ethanol represents the ____.
Definitions:
Pepsinogen
Pepsinogen is an inactive precursor of pepsin, a digestive enzyme produced in the stomach that is activated by stomach acid to break down proteins in food.
Hydrochloric Acid
A strong, corrosive acid consisting of hydrogen and chlorine, notably present in gastric juice.
Amino Acids
The building blocks of proteins, consisting of a basic amino group, an acidic carboxyl group, and a unique side chain, crucial for numerous bodily functions.
Amino Acids
Organic compounds that combine to form proteins, serving as the building blocks of life and playing a critical role in various biological processes.
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