2780
A partial recovery of bupivacaine - induced ECG alterations was observed after pretreatment of the rats with BN 52021 .
 Chemical: bupivacaine; Chemical: BN 52021
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:
 Chemical: bupivacaine; Chemical: BN 52021