keep raising exception with this json text

Jun 6, 2012 at 12:47 PM

I wanted to parse json from this url with json.net: http://m.ftchinese.com/index.php/jsapi/get_last_publish_story?day=2012-6-5

It keeps raising exception "Invalid property identifier character". There are UTF-8 characters (Chinese) in the string. But I can parse it in javascript in Chrome. And the json string works fine on the online json viewer: http://jsonviewer.stack.hu/

Not sure what's wrong with the string or with json.net. Could any one shed some light?