Notwithstanding the time limitations in subsections (a) and (b), if the Uruguay Round of multilateral trade negotiations under the auspices of the General Agreement on Tariffs and Trade has not resulted in trade agreements by May 31, 1993, the President may, during the period after May 31, 1993, and before April 16, 1994, enter into, under subsections (a) and (b) of this section, trade agreements resulting from such negotiations.