5-(Acetylamino)-1,3,4-thiadiazole-2-sulfonic Acid; 2-(Acetylamino)-5-sulfo-1,3,4-thiadiazole; 4-Acetylamino-cyclopenta-1,3-dienesulfonic acid; Acetazolamide acid analog; 5-Acetamido-1,3,4-thiadiazole-2-sulfonic acid; Acetazolamide Related Compound E (USP); Acetazolamide EP Impurity E ;