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In the current study , we crossed mdr1a . fLUC mice into the pxr knockout ( pxr ( - / - ) ) genetic background and injected mice with pregnenolone - 16 alpha - carbonitrile ( PCN ) , a strong PXR ligand , and two therapeutically relevant taxanes , paclitaxel and docetaxel .
 Chemical: pregnenolone - 16 alpha - carbonitrile; Chemical: PCN; Chemical: taxanes; Chemical: paclitaxel; Chemical: docetaxel
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: pregnenolone - 16 alpha - carbonitrile; Chemical: PCN; Chemical: taxanes; Chemical: paclitaxel; Chemical: docetaxel