6898
In combination , these modifications afford potent dual PDE3 / 4 inhibitors that suppress histamine - induced bronchoconstriction in vivo and exhibit promising anti - inflammatory activity via intratracheal administration .
 Chemical: histamine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: histamine