5386
Both the duration and the latency of immobility affected by oleanolic acid ( 10 , 20 and 40 mg / kg ) were evaluated in the FST repeated at intervals on days 1 , 7 and 14 , followed by neurochemical and brain - derived neurotrophic factor ( BDNF ) analyses in the mouse brain regions of frontal cortex and whole hippocampus .
 oleanolic acid
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 oleanolic acid