9164
Using MTS viability assays , withanolides 1 - 5 showed antiproliferative activities against human glioblastoma ( U251 and U87 ) , head and neck squamous cell carcinoma ( MDA - 1986 ) , and normal fetal lung fibroblast ( MRC - 5 ) cells with IC50 values in the range between 0 . 56 and 5 . 6 mu M .
 MTS, withanolides 1 - 5
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 MTS, withanolides 1 - 5