Sarin, or GB (G-series, 'B'), is a colorless, odorless liquid, used as a chemical weapon owing to its extreme potency as a nerve agent. It is generally considered as a weapon of mass destruction. Production and stockpiling of sarin was outlawed as of April 1997 by the Chemical Weapons Convention of 1993, and it is classified as a Schedule 1 substance. In June 1994, the UN Special Commission on Iraqi disarmament destroyed the nerve agent sarin under Security Council resolution 687 (1991) concerning the disposal of Iraq's weapons of mass destruction.