after extraction of acetazolamide and its propionyl analog , 5-propionamido-1,3,4-thiadiazole-2-sulfonamide , the internal standard , from plasma with ethyl acetate and removal of lipids from the residue of the ethyl acetate extract with methylene chloride , the sulfonamides were chromatographed on an octadecyl trichlorosilane bonded phase using high-pressure liquid chromatography .
C0000981
acetazolamide
C0038760
sulfonamides