15212
Compound 15 exhibited promising antimalarial activity against P . falciparum , including drug - resistant isolates , and no rapid drug - resistant populations of the parasite were observed when challenged with 15 .
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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