Predict the number of distinct quartets expected in the off-resonance decoupled 13C NMR spectrum of the compound shown below. 
Definitions:
Midlife Crisis
A psychological crisis occurring in middle age characterized by emotional turmoil, identity questioning, and strong desires for change.
Levinson
Refers to the psychologist Daniel Levinson, known for his theory on human development, particularly the concept of life structures in adult development.
Psychosocial Theory
A framework proposed by Erik Erikson that outlines eight stages of human development, each characterized by a different psychological crisis.
Generativity
A concern for establishing and guiding the next generation, typically observed in middle adulthood.
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