18714
A series of no - chlorine and oxygen - rich hydrazine derivatives ( hydrazine modified with - NO2 and NO3 ( - ) groups ) was designed and optimized to obtain molecular geometries and electronic structures at density functional theory - B3PW91 / 6 - 311 + + G ( 3df , 3pd ) level .
 Chemical: chlorine; Chemical: oxygen; Chemical: hydrazine; Chemical: hydrazine; Chemical: NO2; Chemical: NO3 ( - )
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: chlorine; Chemical: oxygen; Chemical: hydrazine; Chemical: hydrazine; Chemical: NO2; Chemical: NO3 ( - )