Noun
acesulfame potassium (uncountable)
The artificial sweetener, potassium 6-methyl-2,2-dioxo-oxathiazin-4-olate
Acesulfame potassium is a potassium salt of 6-methyl-1,2,3-oxathiazine-4(3H)-one 2,2-dioxide which is an artificial sweetener that is molecularly nothing like aspartame (which is a methly ester of aspartic acid). Source: Internet