161
Our results showed that direct enantiomeric separation of mephenytoin was obtained by using a chiral capillary column , the retention times for S - and R - mephenytoin were 25 . 5 and 26 . 2 min respectively , with a detection limit less than 50 ng / ml of mephenytoin .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 None