2721
Nature , time course and dose dependence of zidovudine - related side effects : results from the Multicenter Canadian Azidothymidine Trial .
 Chemical: zidovudine; Chemical: Azidothymidine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: zidovudine; Chemical: Azidothymidine