9955
Among these , 67 , 68 , 74 , 77 , and 78 exhibited good in vitro antimalarial activity against P . falciparum strains 3D7 and K1 with low cytotoxicity .
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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:
 None