x is a peptide which is hydrolysed to 2 amino acids y and z. y when react with \(HNO_2\) gives lactic acid . z when heated gives cyclic structure as below:
y and z respectively are
(1) Alanine and Lysine
(2) Alanine and Glycine
(3) Glycine and Alanine
(4) Valine and Glycine
