29855
The Lower Limit Of Quantitation ( LLOQ ) was 20 . 0 ng mL ( - 1 ) for 20 ( R , S ) - 25 - OCH3 - PPD , 2 . 0 ng mL ( - 1 ) for 20 ( R , S ) - 25 - OH - PPD in the plasma samples assay .
 Chemical: 20 ( R , S ) - 25 - OCH3 - PPD; Chemical: 20 ( R , S ) - 25 - OH - PPD
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: 20 ( R , S ) - 25 - OCH3 - PPD; Chemical: 20 ( R , S ) - 25 - OH - PPD