The total number of distinct naturally occuring amino acids obtained by complete acidic hydrolysis of the peptide shown as follows is...........

PLAN The solution to this issue is to hydrolyze the peptide and determine the composition of the resulting substance.

Given peptide's hydrolysis results in the following chemical reaction and product:

is glycine, an amino acid that only occurs naturally. B, C, and D are synthetic amino acids; they do not occur naturally.

Therefore, the right integer is (1)