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Discovery of novel cannabinoid receptor ligands by a virtual screening approach : further development of 2 , 4 , 6 - trisubstituted 1 , 3 , 5 - triazines as CB2 agonists .
 2 , 4 , 6 - trisubstituted 1 , 3 , 5 - triazines
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 2 , 4 , 6 - trisubstituted 1 , 3 , 5 - triazines