13215
The increase in SAA expression is specific to ritodrine - induced liver damage , because SAA expression was not induced by other hepatotoxic drugs such as acetaminophen , valproic acid , or metformin .
 Chemical: ritodrine; Chemical: acetaminophen; Chemical: valproic acid; Chemical: metformin
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: ritodrine; Chemical: acetaminophen; Chemical: valproic acid; Chemical: metformin