15407
A cocktail of the drugs ( 2 mg of saquinavir , 100 micro g of each probe ) was administered to eight healthy volunteers ( phase 1 ) , and then coadministered with 20 mg ( phase 2 ) and 100 mg ( phase 3 ) of ritonavir .
 saquinavir, ritonavir
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 saquinavir, ritonavir