Which of the following compounds is indole? 
Definitions:
Visual Information
Data perceived through the sense of sight, including images, symbols, and movements, which are interpreted by the brain to understand the environment.
Communication
The process of transferring information from one entity to another through various means, including verbally, nonverbally, or through written documents.
Endocrine System
A network of glands in the body that secrete hormones directly into the bloodstream, regulating various bodily functions.
Nervous System
The body's complex network of cells and tissues, consisting of the central and peripheral nervous systems, responsible for coordinating voluntary and involuntary actions and transmitting signals between different parts of the body.
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