Examlex
Which of the following compounds can adopt a chair conformation in which there are no axial methyl groups?
Endorphins
These are neurotransmitters produced in the brain that act as natural painkillers and are also associated with feelings of pleasure and well-being.
Serotonin
A neurotransmitter that contributes to feelings of well-being and happiness, also involved in regulating mood, appetite, and sleep.
Sympathetic
Pertaining to the part of the autonomic nervous system that typically increases bodily readiness for action in response to stress.
Peripheral
Relating to or situated on the edge or periphery of something, often considered less important than the core.
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