23790
In the present study , protective effects of S . asper against carbon tetrachloride ( CCl4 ) - induced nephrotoxicity of rats were determined .
 Chemical: carbon tetrachloride; Chemical: CCl4
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: carbon tetrachloride; Chemical: CCl4