4118
In a second experiment , rats received tricyclic antidepressant desipramine IP followed in 15 min by 4 - aminopyridine or saline .
 Chemical: desipramine; Chemical: 4 - aminopyridine
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: desipramine; Chemical: 4 - aminopyridine