Which one of these structures represents an ester functional group 
Definitions:
Aversive Event
An unpleasant or painful stimulus that induces changes in behavior through negative reinforcement or punishment.
Inappropriate Behavior
Actions or responses that are unsuitable or not fitting for the context or situation in which they occur.
Punishment Schedules
The rules or structures that determine the frequency and timing of punishment in the context of behavior modification.
FR-1
A fixed-ratio 1 schedule in operant conditioning, where reinforcement is given after every correct response.
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