Patent ID: 7112318

Claim:
A compound comprising at least one pharmaceutically acceptable anion and a cation represented by the following formula: wherein R 1 is alkyl, alkenyl, alkynyl, haloalkyl, cycloalkyl, or aralkyl, with R 1 being substituted by one or more groups comprising 18 F and optionally substituted by one or more additional groups; R 2 , R 3 , and R 4 are independently selected at each occurrence of R 2 , R 3 , and R 4 from the group consisting of hydrogen, halogen, cyano, nitro, optionally substituted alkyl, optionally substituted alkenyl, optionally substituted alkynyl, optionally substituted alkoxy, optionally substituted (cycloalkyl)alkyl, optionally substituted alkyithio, optionally substituted alkylsulfinyl, or optionally substituted alkylsulfonyl, and optionally substituted mono or dialkylcarboxamide; and p, q, and r are independently selected numbers from zero to 5.