27407
Determination of urinary 6 - mercaptopurine and three of its metabolites by HPLC - UV coupled with the iodine - azide reaction .
 Chemical: 6 - mercaptopurine; Chemical: iodine; Chemical: azide
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: 6 - mercaptopurine; Chemical: iodine; Chemical: azide