18981
Our data from 57 drugs and 4 metabolites of earlier and 2 metabolites of newly recognized outliers ( phenacetin and bupropion ) using our pH - gradient PAMPA system show a good correlation with in vivo PLD data .
 phenacetin, bupropion
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 phenacetin, bupropion