20009
The aim was to assess the impact on biological activities of the replacement of the 1 , 2 , 4 - thiadiazine ring by an isosteric 1 , 4 , 2 - dithiazine ring .
 Chemical: 1 , 2 , 4 - thiadiazine; Chemical: 1 , 4 , 2 - dithiazine
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: 1 , 2 , 4 - thiadiazine; Chemical: 1 , 4 , 2 - dithiazine