23359
The structure was determined as a new naphthoquinone derivative with an acetylhydrazino moiety by a combination of NMR , MS spectral analyses , and chemical degradation .
 Chemical: naphthoquinone; Chemical: acetylhydrazino
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: naphthoquinone; Chemical: acetylhydrazino