18539
On the basis of our previously reported 2 - arylpyrazolo [ 4 , 3 - d ] pyrimidin - 7 - ones , a set of 2 - arylpyrazolo [ 4 , 3 - d ] pyrimidin - 7 - amines were designed as new human ( h ) A3 adenosine receptor ( AR ) antagonists .
 Chemical: 2 - arylpyrazolo [ 4 , 3 - d ] pyrimidin - 7 - ones; Chemical: 2 - arylpyrazolo [ 4 , 3 - d ] pyrimidin - 7 - amines; Chemical: adenosine
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 - arylpyrazolo [ 4 , 3 - d ] pyrimidin - 7 - ones; Chemical: 2 - arylpyrazolo [ 4 , 3 - d ] pyrimidin - 7 - amines; Chemical: adenosine