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These lemon essential oils showed strong ability to improve memory impaired by scopolamine ; however , s - perillyl alcohol relieved the deficit of associative memory in PA only , and did not improve non - associative memory significantly in OFH .
 memory impaired, scopolamine, s - perillyl alcohol, deficit of associative memory
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 memory impaired, scopolamine, s - perillyl alcohol, deficit of associative memory