26230
Reduction of the carbonyl groups lead to the 20 - epi - 12 , 23 - dihydroxy - 22 - oxo system 11a - b .
 Chemical: carbonyl; Chemical: 20 - epi - 12 , 23 - dihydroxy - 22 - oxo
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: carbonyl; Chemical: 20 - epi - 12 , 23 - dihydroxy - 22 - oxo