Identify the most acidic proton on the following compound. 
Definitions:
Spontaneous Recovery
The reappearance of a previously extinguished response after a period without exposure to the conditioned stimulus.
Conditioned Stimulus
An initially neutral trigger that, after being paired with an unconditioned stimulus, in time invokes a conditioned response.
Unconditioned Stimulus
A stimulus that inherently and instinctively induces a reaction without the need for previous learning.
Negative Punishment
The removal of a desirable stimulus after a behavior, which decreases the likelihood of the behavior occurring again.
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