24590
The natural product belactosin A ( 1 ) with a trans - cyclopropane structure is a useful prototype compound for developing potent proteasome ( core particle , CP ) inhibitors .
 belactosin A, trans - cyclopropane
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 belactosin A, trans - cyclopropane