8270
Finally , on the basis of 11 cocrystal structures bound to CDK9 / cyclin T or CDK2 / cyclin A , we conclude that selective inhibition of CDK9 / cyclin T by members of the 4 - ( thiazol - 5 - yl ) - 2 - ( phenylamino ) pyrimidine - 5 - carbonitrile series results from the relative malleability of the CDK9 active site rather than from the formation of specific polar contacts .
 Chemical: 4 - ( thiazol - 5 - yl ) - 2 - ( phenylamino ) pyrimidine - 5 - carbonitrile
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: 4 - ( thiazol - 5 - yl ) - 2 - ( phenylamino ) pyrimidine - 5 - carbonitrile