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Because clinical studies investigating interactions between garlic and human immunodeficiency virus protease inhibitors saquinavir and ritonavir have already been performed , we used these in vivo data to evaluate the in vitro results and the reliability of the models employed as screening tools for forecasting the potential of first - pass intestinal metabolism changes .
 Chemical: saquinavir; Chemical: ritonavir
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: saquinavir; Chemical: ritonavir