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Compounds 1 - 6 and 1a ( microgrewiapine A 3 - acetate ) showed a range of cytotoxicity values against the HT - 29 human colon cancer cell line .
 microgrewiapine A 3 - acetate
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 microgrewiapine A 3 - acetate