21.   U.S. officials have cited a soil sample taken from the grounds of the complex that they say contained Empta, a precursor chemical for the deadly nerve agent VX.

22.   A second agreement aiming to stem the traffic of precursor chemicals used in manufacturing drugs such as cocaine was also broached by Clinton and Bruton.

23.   China has become the primary source of precursor chemicals being used to produce illicit drugs in Burma which are then sent to Thailand, a Burmese official said Thursday.

24.   The US officials said the sensitive equipment included glass-lined vessels for mixing caustic precursor chemicals and special air filtration equipment to prevent deadly poison gas leaks.

25.   Thailand is concerned at the illicit trade in amphetamines and precursor chemicals from China.