How many chiral centres are there in 7-dehydrocholesterol (shown below) ? 
Definitions:
Optimal Experience
Experiences that are highly involving and fulfilling, often referred to as "flow," where individuals lose sense of time and are completely absorbed in the activity.
Self-Actualization
A psychological concept in humanistic theories that represents the realization or fulfilment of one's talents and potentialities, considered as the ultimate goal of personal development.
Self-Determination Theory
A theory of motivation that emphasizes the role of intrinsic motivation and psychological needs in personal growth and behavioral self-regulation.
Eudaimonic Pleasure
A sense of fulfillment and happiness derived from living in accordance with one's true self and realizing one's potential.
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