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Structural optimization of 2 , 5 - thiophene amides as highly potent and selective 17 beta - hydroxysteroid dehydrogenase type 2 inhibitors for the treatment of osteoporosis .
 Chemical: 2 , 5 - thiophene amides; Chemical: 17 beta - hydroxysteroid
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: 2 , 5 - thiophene amides; Chemical: 17 beta - hydroxysteroid