22369
In " pinking " of onion , E - ( + ) - S - ( 1 - propenyl ) - l - cysteine sulfoxide is first cleaved by alliinase to yield colour developers ( CDs ) , which react with amino acids , such as valine , to form pigment precursors ( PPs ) .
 Chemical: E - ( + ) - S - ( 1 - propenyl ) - l - cysteine sulfoxide; Chemical: amino acids; Chemical: valine
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: E - ( + ) - S - ( 1 - propenyl ) - l - cysteine sulfoxide; Chemical: amino acids; Chemical: valine