24042
Reduction of the bioreductive group nitro moiety , under hypoxic conditions , reveals an electron - donating substituent that leads to fragmentation of the molecule , affording the active inhibitor .
 Chemical: nitro
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: nitro