3431
In this report the biological properties of the compounds ZK161422 and ZK157202 , which are 20-methyl- and 20-methyl-23- eneanalogues , respectively, have been analyzed in comparison with VD .
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Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
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