25850
Discovery and synthesis of novel 4 - aminopyrrolopyrimidine Tie - 2 kinase inhibitors for the treatment of solid tumors .
 4 - aminopyrrolopyrimidine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 4 - aminopyrrolopyrimidine