21217
Synthesis and biological evaluation of prodrugs of 2 - fluoro - 2 - deoxyribose - 1 - phosphate and 2 , 2 - difluoro - 2 - deoxyribose - 1 - phosphate .
 Chemical: 2 - fluoro - 2 - deoxyribose - 1 - phosphate; Chemical: 2 , 2 - difluoro - 2 - deoxyribose - 1 - phosphate
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: 2 - fluoro - 2 - deoxyribose - 1 - phosphate; Chemical: 2 , 2 - difluoro - 2 - deoxyribose - 1 - phosphate