While Western powers have identified a small group of sectors for Iranian sanction relief, a much wider set of European and U.S. companies—from pharmaceutical firms and medical-equipment makers to food companies and traders—also stands to regain lost Iranian trade as soon as relief measures are formally adopted next month. Western governments singled out Iran’s automotive and aviation sectors for temporary sanction relief, while allowing petrochemical exports and trade in gold and other precious metals. But the fine print of the deal also clears the way for GlaxoSmithKline