1. Research scientists, Drug Identification Division, Bureau of Drug Research, Health Protection Branch, Health and Welfare Canada, Tunney's Pasture Ottawa, Ontario, CA K1A 0L2.
2. Head, Chemistry Section, Drug Identification Division, Bureau of Drug Research, Health Protection Branch, Health and Welfare Canada, Ottawa, Ontario, CA.
3. Head, Spectroscopy Section, Drug Identification Division, Bureau of Drug Research, Health Protection Branch, Health and Welfare Canada, Ottawa, Ontario, CA.