ServiceStack.Text and DeserializeFromString

I most admit that I'm probably forgetting something really simple, but I can't figure it out what I have a class: ``` public class UserAgentInfo { public string agent_type { get; set; } public string agent_name { get; set; } public string agent_version { get; set; } public string os_type { get; set; } public string os_name { get; set; } public string os_versionName { get; set; } public string os_versionNumber { get; set; } public string linux_distibution { get; set; } } ``` then I get the Json string from a Url and try to deserialize it as: ``` using (System.Net.WebClient wc = new System.Net.WebClient()) { string json = wc.DownloadString("http://www.useragentstring.com/?getJSON=agent_type-agent_name-agent_version-os_type-os_name-os_versionName-os_versionNumber-linux_distibution&uas=" + o.Browser); agentInfo = ServiceStack.Text.TypeSerializer.DeserializeFromString<UserAgentInfo>(json); } ``` the `json` string is: ``` "{\"agent_type\":\"Browser\",\"agent_name\":\"Chrome\",\"agent_version\":\"28.0.1500.72\",\"os_type\":\"Windows\",\"os_name\":\"Windows 7\",\"os_versionName\":\"\",\"os_versionNumber\":\"\",\"linux_distibution\":\"Null\"}" ``` or for the ones that are not used to C# ``` "{"agent_type":"Browser","agent_name":"Chrome","agent_version":"28.0.1500.72","os_type":"Windows","os_name":"Windows 7","os_versionName":"","os_versionNumber":"","linux_distibution":"Null"}" ``` and the returned object is: ``` {...UserAgentInfo} agent_name: null agent_type: null agent_version: null linux_distibution: null os_name: null os_type: null os_versionName: null os_versionNumber: null ``` What am I missing?