11428
Both CYP2B6 . 6 and CYP2B6 . 1 showed similar stereoselectivity ( S > R - methadone ) .
 Chemical: S > R - methadone
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: S > R - methadone