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These effects were not due to its bioconversion to 5 alpha - DHP nor to allopregnanolone , as supported by the finasteride , an inhibitor of 5 alpha - reductase enzymes , and by the absence of 5 alpha - reduced progesterone metabolites in the slices analyzed by gas chromatography - mass spectrometry .
 Chemical: 5 alpha - DHP; Chemical: allopregnanolone; Chemical: finasteride; Chemical: progesterone
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: 5 alpha - DHP; Chemical: allopregnanolone; Chemical: finasteride; Chemical: progesterone