6559
However , uptake of pyrimidines in bloodstream form trypanosomes has not been investigated , making it difficult to judge the relative importance of salvage and synthesis or to design a pyrimidine - based chemotherapy .
 Chemical: pyrimidines; Chemical: pyrimidine
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: pyrimidines, pyrimidine 
Answer:
 Chemical: pyrimidines; Chemical: pyrimidine