19915
The extracted DNA was hydrolyzed and 2 ' - deoxycytidine and 5 - methyl - 2 ' - deoxycytidine were determined by HPLC - UV .
 Chemical: 2 ' - deoxycytidine; Chemical: 5 - methyl - 2 ' - deoxycytidine
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 ' - deoxycytidine; Chemical: 5 - methyl - 2 ' - deoxycytidine