Chemistry - Biomolecules Question with Solution | TestHub

A dipeptide, " $x$ " on complete hydrolysis gives " $y$ " and " $z$ ". " $y$ " on treatment with aq. ${\mathrm{HNO}}_2$ produces lactic acid. On the other hand " $z$ " on heating gives the following cyclic molecule.

Based on the information given, the dipeptide X is: