Sodium Saccharin (benzoic sulfimide) is an artificial sweetener with effectively no food energy that is about 300–400 times as sweet as sucrose but has a bitter or metallic aftertaste, especially at high concentrations. It is used to sweeten products such as drinks, candies, cookies, and medicines.
artificial sweetener is not as sweet 
( z1 sweet :polarity - :ARG1 ( z2 sweetener :mod ( z3 artificial ) ) :ARG2-of ( z4 have-degree :ARG1 z2 :ARG3 ( z5 equal ) ) )