21506
Taken together , this result indicates the possible pharmacophoric role of the 2 - pyridinylpiperazine functionality attached to the chromone scaffold , which warrants further in - depth structure - activity relationship study .
 Chemical: 2 - pyridinylpiperazine; Chemical: chromone
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: 2 - pyridinylpiperazine; Chemical: chromone