22100
A series of sugar - modified derivatives of cytostatic 7 - heteroaryl - 7 - deazaadenosines ( 2 ' - deoxy - 2 ' - fluororibo - and 2 ' - deoxy - 2 ' , 2 ' - difluororibonucleosides ) bearing an aryl or heteroaryl group at position 7 was prepared and screened for biological activity .
 Chemical: sugar; Chemical: 7 - heteroaryl - 7 - deazaadenosines; Chemical: 2 ' - deoxy - 2 ' - fluororibo - and 2 ' - deoxy - 2 ' , 2 ' - difluororibonucleosides; Chemical: aryl; Chemical: heteroaryl
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: sugar; Chemical: 7 - heteroaryl - 7 - deazaadenosines; Chemical: 2 ' - deoxy - 2 ' - fluororibo - and 2 ' - deoxy - 2 ' , 2 ' - difluororibonucleosides; Chemical: aryl; Chemical: heteroaryl