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The HDAC inhibitory assay and cell - growth inhibition analysis of the synthesized depsipeptides determined the order of potency of spiruchostatins A - D in comparison with the clinically approved depsipeptide FK228 ( romidepsin ) .
 spiruchostatins A - D, FK228, romidepsin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 spiruchostatins A - D, FK228, romidepsin