8891
We have synthesized 3 ' - modified oligodeoxyribonucleotides ( ODNs ) using 5 ' --> 3 ' ' reverse ' DNA synthesis for the study of 2 - deoxyribose oxidative damage to DNA .
 Chemical: 2 - deoxyribose
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 - deoxyribose