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c# - json error Bad JSON escape sequence

I am working with json but i got an error Bad JSON escape sequence

    var model = JsonConvert.DeserializeObject<test>(def);
public class test
    {
        public string test123 { get; set; }
    }

My json def is "{"test123 ": "?'?u00141u0019?\±y?± u0013Eú", }"

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Please use 4 back slashes to print a single back slash in the resultant JSON string. Two slashes turns into one slash and escapes C#'s string only, to escape JSON, you will need another two. Or use can use the @ string for simplification.

"{"test123 ": "?'?u00141u0019?\\±y?± u0013Eú", }"

Or

@"{""test123 "": ""?'?u00141u0019?\±y?± u0013Eú"", }"

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