. . . . . . "illicit"@en . . . . . . "Petrow, V., Thomas, A.J. and Stephenson, O.; U.S. Patent 3,028,420; April 3,1962; assigned to The British Drug Houses Limited, England."@en . . "2218-68-0"@en . . . . . . . "Chloral betaine"@en . . . . . . . . "withdrawn"@en . . . . . .