Consider the following spectrum of a carboxylic acid derivative. 
This spectrum indicates the presence of a ___________group.
Definitions:
Sleep
Sleep is a naturally recurring state of mind and body, characterized by altered consciousness, reduced sensory activity, and inhibition of nearly all voluntary muscles.
Hypnogogic Images
Visual or auditory experiences that occur in the transitional state from wakefulness to sleep.
Sleep Spindles
Sleep spindles are sudden bursts of oscillatory brain activity visible on an EEG during Stage 2 sleep, associated with memory consolidation and synaptic plasticity.
Delta Waves
Slow, high amplitude brainwaves of less than 4 Hz that are typically associated with the deepest stages of sleep and unconsciousness.
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