10215
Ten compounds ( 4k , 4l , 4r , 5k , 5l , 5q , 5r , 6k , 6l and 6r ) showed better or similar activity as compared to the reference compound ascorbic acid .
 ascorbic acid
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 ascorbic acid