5790
Compounds 2c , 3c , 4c , 5c , 6c and 8b showed better anti - tumor activities compared to the parent compound 25 - OH - PPD .
 Chemical: 25 - OH - PPD
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: 25 - OH - PPD