4560
In this study , polydatin showed inhibitory activities on xanthine oxidase to repress the level of serum uric acid in vivo and in vitro .
 Chemical: polydatin; Chemical: xanthine; Chemical: uric acid
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: polydatin; Chemical: xanthine; Chemical: uric acid