27408
Background : The presented method is able to determine 6 - mercaptopurine ( 6 - MP ) , 6 - thioguanine , 6 - mercaptopurine riboside and 6 - thioguanine riboside in urine , and is thereby dedicated to control of thiopurine therapy of children with acute lymphoblastic leukemia .
 Chemical: 6 - mercaptopurine; Chemical: 6 - MP; Chemical: 6 - thioguanine; Chemical: 6 - mercaptopurine riboside; Chemical: 6 - thioguanine riboside; Chemical: thiopurine
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: 6 - MP; Chemical: 6 - thioguanine; Chemical: 6 - mercaptopurine riboside; Chemical: 6 - thioguanine riboside; Chemical: thiopurine