3151
In order to elucidate the role of the catecholaminergic system in the cataleptogenic effect of delta 9 - tetrahydrocannabinol ( THC ) , the effect of pretreatment with 6 - hydroxydopamine ( 6 - OHDA ) or with desipramine and 6 - OHDA and lesions of the locus coeruleus were investigated in rats .
 delta 9 - tetrahydrocannabinol, THC, 6 - hydroxydopamine, 6 - OHDA, desipramine, 6 - OHDA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 delta 9 - tetrahydrocannabinol, THC, 6 - hydroxydopamine, 6 - OHDA, desipramine, 6 - OHDA