27571
This finding indicates that NK - 252 is more potent than OPZ due to its unique mechanism of action .
 Chemical: NK - 252; Chemical: OPZ
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: NK - 252, OPZ 
Answer:
 Chemical: NK - 252; Chemical: OPZ