21312
Addition of 10 mu M of progesterone , 5 alpha - dihydroprogesterone ( 5 alpha - DHP ) or allopregnanolone ( 3 alpha , 5 alpha - tetrahydroprogesterone ) to the medium at the time of injury rescued the spinal cord slices from the effects of damage .
 Chemical: progesterone; Chemical: 5 alpha - dihydroprogesterone; Chemical: 5 alpha - DHP; Chemical: allopregnanolone; Chemical: 3 alpha , 5 alpha - tetrahydroprogesterone
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: progesterone; Chemical: 5 alpha - dihydroprogesterone; Chemical: 5 alpha - DHP; Chemical: allopregnanolone; Chemical: 3 alpha , 5 alpha - tetrahydroprogesterone