20574
The long - term stability of 3 - hydroxyazetidine amides is established at acidic and neutral pH and implies their value as non - proteinogenic amino acid components of peptides , providing medicinal chemists with a new class of peptide isosteres .
 Chemical: 3 - hydroxyazetidine amides; Chemical: amino acid
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: 3 - hydroxyazetidine amides; Chemical: amino acid