How to acess object provided by Ajax

Good Afternoon.

I´m trying to acess data from this URL "https://corsanywhere.herokuapp.com/http://services.odata.org/V2/(S(frik5l2zde0sxh4jiifyhqo4))/OData/OData.svc/Products(2)";

I can acess to this Data , doing this code :

var x;

  var aUrl =

  "https://cors-anywhere.herokuapp.com/http://services.odata.org/V2/(S(frik5l2zde0sxh4jiifyhqo4))/OData/OData.svc/Products(2)";

  var oModel = new sap.ui.model.json.JSONModel();

  var aData = jQuery.ajax({

  type: "GET",

  contentType: "application/json",

  url: aUrl,

  dataType: "json",

  success: function(data, textStatus, jqXHR) {

            x = data.valueOf();

            alert(x.Rating);

  }

  });

But when I try to acess the attribute x.Rating , he says that is unsigned .

Can tell me how to acess to some attribute from data ?

Thanks