3959
Surprisingly , PNU - 120596 ' s antinociceptive effects were blocked by NS1738 .
 Chemical: PNU - 120596; Chemical: NS1738
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: PNU - 120596; Chemical: NS1738