Artificial sweetening agent from below is

It is a sugar substitute in a food, that provides sweet taste but has no or very little amount of energy, i.e. it has zero or low calorie. Aspartame is an example of artificial sweetening agent, it is about 200 times sweeter than sucrose and is used in beverages and cold drinks. It is a methyl ester of aspartic acid. It has molecular formula $\mathrm{C}_{14} \mathrm{H}_{18} M_2 \mathrm{O}_5$.