8334
Discovery , synthesis , and structure - based optimization of a series of N - ( tert - butyl ) - 2 - ( N - arylamido ) - 2 - ( pyridin - 3 - yl ) acetamides ( ML188 ) as potent noncovalent small molecule inhibitors of the severe acute respiratory syndrome coronavirus ( SARS - CoV ) 3CL protease .
 N - ( tert - butyl ) - 2 - ( N - arylamido ) - 2 - ( pyridin - 3 - yl ) acetamides, ML188
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 N - ( tert - butyl ) - 2 - ( N - arylamido ) - 2 - ( pyridin - 3 - yl ) acetamides, ML188