net481 
namespace System.Net.Http.Formatting
{
    public abstract class BaseJsonMediaTypeFormatter : MediaTypeFormatter
}
nuget.org
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.NET Framework
4.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
Information specific to net481
Assembly

System.Net.Http.Formatting , Version=6.0.0.0, PublicKeyToken=31bf3856ad364e35

Referencing

Your project needs a package reference to Microsoft.AspNet.WebApi.Client.

Package Microsoft.AspNet.WebApi.Client (6.0.0) net45
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This framework does not have platform annotations.

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  • Package-provided API