17667
Characterization , using GC - MS and GC - MS / MS , of 11oxo - pregnanes and 11oxo - pregnenes .
 Chemical: 11oxo - pregnanes; Chemical: 11oxo - pregnenes
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: 11oxo - pregnanes; Chemical: 11oxo - pregnenes