17201
In the present study , we examined the effect of gallic acid ( GA ; 50 , 100 and 200mg / kg , p . o . for 10 days ) on memory deficit and cerebral oxidative stress induced by 6 - hydroxydopamine ( 6 - OHDA ; 8 mu g / 2 mu L ) injected into the medial forebrain bundle ( MFB , full nigral lesion ) as an animal model of Parkinson ' s disease ( PD ) .
 gallic acid, 6 - hydroxydopamine, 6 - OHDA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
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Answer:
 gallic acid, 6 - hydroxydopamine, 6 - OHDA