11069
In contrast , the same treatment increased kcat for substrates containing a 1 , 2 - diketo group in a ring structure ( 1 , 2 - naphthoquinone , 9 , 10 - phenanthrenequinone , isatin ) .
 Chemical: 1 , 2 - diketo; Chemical: 1 , 2 - naphthoquinone; Chemical: 9 , 10 - phenanthrenequinone; Chemical: isatin
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 - diketo; Chemical: 1 , 2 - naphthoquinone; Chemical: 9 , 10 - phenanthrenequinone; Chemical: isatin