22099
Synthesis and Cytostatic and Antiviral Activities of 2 ' - Deoxy - 2 ' , 2 ' - difluororibo - and 2 ' - Deoxy - 2 ' - fluororibonucleosides Derived from 7 - ( Het ) aryl - 7 - deazaadenines .
 Chemical: 2 ' - Deoxy - 2 ' , 2 ' - difluororibo - and 2 ' - Deoxy - 2 ' - fluororibonucleosides; Chemical: 7 - ( Het ) aryl - 7 - deazaadenines
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 ' - Deoxy - 2 ' , 2 ' - difluororibo - and 2 ' - Deoxy - 2 ' - fluororibonucleosides; Chemical: 7 - ( Het ) aryl - 7 - deazaadenines