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The prolongation of half - life ( t ( 1 / 2 ) ) from 4 . 5 +/- 2 . 41 h to 14 . 12 +/- 4 . 81 h indicated extended duration of action .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None