609
Among them , 13 extracts were significantly active with inhibitory concentration 50 ( IC ( 50 ) ) from 1 . 2 to 3 . 7 micro g / mL and 2 extracts were moderately active ( IC ( 50 ) = 6 . 1 and 10 micro g / mL , respectively ) , whereas sample XI was not active ( IC ( 50 ) = 19 . 6 micro g / mL ) .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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