What functional group is present in the following compound? 
Definitions:
Alpha Waves
These are brain waves detected by electroencephalography (EEG), typically indicating a state of wakeful relaxation.
Oval Window
A membrane-covered opening at the base of the stapes bone in the middle ear that transfers sound vibrations to the cochlea.
Basilar Membrane
A membrane in the cochlea of the inner ear that vibrates in response to sound and whose vibrations lead to activity in the auditory pathways of the brain.
Middle Ear
The part of the ear between the eardrum and the oval window that contains three small bones which transmit sound vibrations.
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