Chicago WKT throws "Invalid WKT String"

[percebus]

var oWktReader = new WktReader();
string wktString = @"POLYGON ((-87.93939 41.98667, -87.93933 41.98729, -87.93906 41.98911, -87.93904 41.99125, -87.939 41.99286, -87.93892 41.99358, -87.93872 41.99456, -87.93848 41.9954, -87.93824 41.99608, -87.93802 41.99657, -87.93761 41.99741, -87.93717 41.99813, -87.93697 41.99844, -87.93649 41.9991, -87.93571 42.00005, -87.93535 42.00043, -87.93492 42.00086, -87.9346 42.00116, -87.93409 42.0016, -87.93354 42.00209, -87.93287 42.00254, -87.93201 42.00318, -87.93012 42.00454, -87.92949 42.00501, -87.92938 42.00473, -87.93017 42.00417, -87.93125 42.00341, -87.93153 42.00316, -87.93168 42.00286, -87.93169 42.00272, -87.93166 42.00237, -87.93156 42.00215, -87.93139 42.00197, -87.93001 42.00308, -87.92806 42.00466, -87.92634 42.00542, -87.92549 42.00606, -87.92452 42.00644, -87.92295 42.00678, -87.92106 42.00567, -87.91867 42.00531, -87.91549 42.00518, -87.91373 42.00488, -87.91371 42.00869, -87.91347 42.0087, -87.91342 42.0062, -87.91321 42.0062, -87.91319 42.00507, -87.90887 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-87.69112 41.69716, -87.69118 41.69899, -87.69615 41.69896))";

// throws "Invalid WKT String"
IGeometry oGeometry = oWktReader.Read(wktString);