Which of the following structures is N-benzyl-N-propyl-2,3-dimethylbutanamide? 
Definitions:
Psychological Distress
A state of emotional suffering characterized by symptoms of depression and anxiety, often triggered by stress or significant life changes.
Self-actualization Needs
The highest level in Maslow's hierarchy of needs, referring to the realization of a person's potential, self-fulfillment, seeking personal growth and peak experiences.
Aesthetic Needs
Needs that relate to appreciation and search for beauty, form, and artistic harmony.
Esteem Needs
A psychological necessity for human beings that entails the desire for self-respect, self-esteem, and the respect of others; part of Maslow's hierarchy of needs.
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