By Blake Brittain WASHINGTON (Reuters) -The U.S. Supreme Court on Thursday turned down Novartis’ bid to block the launch of generic versions of the company’s blockbuster multiple sclerosis drug Gilenya in a dispute with China’s HEC Pharm Co Ltd and other generic drugmakers. Novartis had asked the justices to suspend a lower court’s ruling that lifted a ban on generic versions of Gilenya, the Switzerland-based company’s third highest-selling drug last year with $2.8 billion in sales. Representatives for the companies did not immediately respond to requests for comment. Novartis sued HEC and mor…