15724
The results indicate that the structure of HSYA is different than the previously described 1b , with 3 - enol - 1 , 7 - diketo form .
 HSYA, 3 - enol - 1 , 7 - diketo
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 HSYA, 3 - enol - 1 , 7 - diketo