System.Collections.Specialized.HybridDictionary class is missing

Hi,
I want to implement functionality using HybridDictionary. I can add reference of System.Collections.Specialized but its missing HybridDictionary class definition. Only
INotifyCollectionChanged
NotifyCollectionChangedAction
NotifyCollectionChangedEventArgs
NotifyCollectionChangedEventHandler

are present into it.

Am I missing any thing to add?

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