acesulfame potassium

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a·ce·sul·fame potassium

 (ā′sē-sŭl′fām′)
n.
A white crystalline powder, C4H4KNO4S, having a taste about 200 times sweeter than sucrose, used as a calorie-free sweetener. Also called acesulfame K.

[Alteration of earlier acetosulfam (perhaps influenced by aspartame) : aceto- + sulf(o)- + am(ine).]