18713
Theoretical study of the thermodynamic and burning properties of oxygen - rich hydrazine derivatives - green and powerful oxidants for energetic materials .
 Chemical: oxygen; Chemical: hydrazine
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: oxygen; Chemical: hydrazine