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These chemical studies offer an alternate hypothesis for the mechanism of action of nitroaromatic anti - TB agents , in that the cysteine thiol ( ate ) or a hydride source at the active site of DprE1 may trigger the reduction of the nitro groups in a manner similar to the von Richter reaction to the nitroso intermediates , to initiate the inhibition of DprE1 .
 Chemical: nitroaromatic; Chemical: cysteine thiol ( ate ); Chemical: hydride; Chemical: nitro; Chemical: nitroso
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: nitroaromatic; Chemical: cysteine thiol ( ate ); Chemical: hydride; Chemical: nitro; Chemical: nitroso