19970
By modifying the substituents on the 7 - amino - 5 - thio - thiazolo [ 4 , 5 - d ] pyrimidine core structure , we were able to achieve compounds with high selectivity for CX3CR1 over the closely related CXCR2 receptor .
 Chemical: 7 - amino - 5 - thio - thiazolo [ 4 , 5 - d ] pyrimidine
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: 7 - amino - 5 - thio - thiazolo [ 4 , 5 - d ] pyrimidine