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Specifically , ritonavir - boosted lopinavir - and atazanavir - based regimens are preferred in pregnancy , while ritonavir - boosted darunavir - and saquinavir - based therapies are reasonable alternatives .
 Chemical: ritonavir; Chemical: lopinavir; Chemical: atazanavir; Chemical: ritonavir; Chemical: darunavir; Chemical: saquinavir
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: ritonavir; Chemical: lopinavir; Chemical: atazanavir; Chemical: ritonavir; Chemical: darunavir; Chemical: saquinavir