Amazon API book search

I am trying to get get some keywords or tags from an amazon book. Example the book How To Lose 10 Pounds In A Week (http://ift.tt/1CiyDXa) I would like a list of keywords that match this book, but everything RequestGroup i try that might have this list ether returns "Feature Tags is deprecated." or no result at all.

Is it even possible to get such a list from amazon, or do i have to extract the keywords myself?

Short: What ResponseGroup do i need to add to my Amazon API call to get a list of keyword/tag for the book i am requesting information for?

Here is the code that i am using to test with:

    SprightlySoftAWS.REST MyREST = new SprightlySoftAWS.REST();

    String RequestURL;
    RequestURL = "http://ift.tt/1wJHsSX";
    RequestURL += "&AWSAccessKeyId=" + System.Uri.EscapeDataString(MY_AWS_ACCESS_KEY_ID) + "&SignatureVersion=2&SignatureMethod=HmacSHA256&Timestamp=" + Uri.EscapeDataString(DateTime.UtcNow.ToString("yyyy-MM-dd\\THH:mm:ss.fff\\Z"));
    RequestURL += "&ItemId=B00L9B7IKE";
    RequestURL += "&IdType=ASIN";
    //RequestURL += "&SearchIndex=Books";
    RequestURL += "&AssociateTag=" + MY_AWS_Associate_Tag;
    RequestURL += "&ResponseGroup=Large,SalesRank";

    String RequestMethod;
    RequestMethod = "GET";

    String SignatureValue;
    SignatureValue = MyREST.GetSignatureVersion2Value(RequestURL, RequestMethod, "", MY_AWS_SECRET_KEY);

    RequestURL += "&Signature=" + System.Uri.EscapeDataString(SignatureValue);

    Boolean RetBool;
    RetBool = MyREST.MakeRequest(RequestURL, RequestMethod, null);
    System.Diagnostics.Debug.Print(MyREST.LogData);

    if (RetBool == true)
    {
        String ResponseMessage = "";
        System.Xml.XmlDocument MyXmlDocument;
        System.Xml.XmlNamespaceManager MyXmlNamespaceManager;
        System.Xml.XmlNode MyXmlNode;
        System.Xml.XmlNodeList MyXmlNodeList;

        MyXmlDocument = new System.Xml.XmlDocument();
        MyXmlDocument.LoadXml(MyREST.ResponseString);
        File.WriteAllText("output.xml", MyREST.ResponseString);
    }
    else
    {
        Console.WriteLine(MyREST.ResponseStringFormatted);
        Console.ReadLine();
    }