20049
Among them , conjugates Aoc - beta Ala - P26 and Noc - beta Ala - P26 exhibited a low nanomolar IC50 in the cell - cell fusion assay and effectively inhibited T20 - sensitive and - resistant HIV - 1 strains .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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