Is the molecule shown below chiral or achiral? Explain what this means. 
Definitions:
Sleep Stages
The different phases of sleep that a person goes through in a typical night, including REM and multiple stages of non-REM sleep, each having distinct characteristics.
REM
Rapid Eye Movement, a phase of sleep characterized by fast and random movement of the eyes, associated with dreaming.
Ordinary Night
Describes a typical or unremarkable night without any special events or occurrences.
REM Sleep
A sleep phase characterized by Rapid Eye Movement, during which most dreaming occurs and brain activity closely resembles that of being awake.
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