simplejson can't load some valid javscript/JSON

simplejson rejects

{access_token: "596A96CC7BF9108CD896F33C44AEDC8A", user_id: 20666}

but accepts quoted keys

{"access_token": "596A96CC7BF9108CD896F33C44AEDC8A", "user_id": 20666}

    result = simplejson.loads(response.read())
  File "/var/lib/python-support/python2.5/simplejson/__init__.py", line 262, in loads
    return _default_decoder.decode(s)
  File "/var/lib/python-support/python2.5/simplejson/decoder.py", line 251, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/var/lib/python-support/python2.5/simplejson/decoder.py", line 270, in raw_decode
    raise ValueError("No JSON object could be decoded")
ValueError: No JSON object could be decoded