Which of the following molecules are achiral? 
Definitions:
Ovarian Hormones
Hormones produced by the ovaries, including estrogen and progesterone, that regulate reproductive functions and influence other physiological processes.
Serotonin
A neurotransmitter that plays a key role in mood regulation, digestion, sleep, and other important bodily functions.
Norepinephrine
A neurotransmitter and hormone involved in the body's fight or flight response, influencing heart rate, blood pressure, and glucose metabolism.
Amygdala
A region of the brain involved in experiencing emotions, such as fear and pleasure.
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