27657
It showed a significant antimalarial activity , with a 50 % inhibitory concentration ( IC50 ) of 0 . 53 +/- 0 . 2 mu M against a chloroquine - resistant strain of Plasmodium falciparum .
 Chemical: chloroquine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: chloroquine