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We compared the systemic toxicity of bupivacaine , levobupivacaine , and ropivacaine in anesthetized rats .
 Disease: toxicity; Chemical: bupivacaine; Chemical: levobupivacaine; Chemical: ropivacaine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Disease: toxicity; Chemical: bupivacaine; Chemical: levobupivacaine; Chemical: ropivacaine