22825
A series of imidazopyridazines which are potent inhibitors of Plasmodium falciparum calcium - dependent protein kinase 1 ( PfCDPK1 ) was identified from a high - throughput screen against the isolated enzyme .
 Chemical: imidazopyridazines; Chemical: calcium
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: imidazopyridazines; Chemical: calcium