4393
Two groups of 22 similar patients were studied : one group received 6 mL prilocaine 2 % ; and the other received 3 mL bupivacaine 0 . 5 % .
 prilocaine, bupivacaine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 prilocaine, bupivacaine