17673
GC - MS and GC - MS / MS spectra were used together to determine the structure of hitherto undescribed 11oxo - pregnane ( enes ) .
 Chemical: 11oxo - pregnane ( enes )
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 - pregnane ( enes )