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Based on docking studies we evaluated in a [ ( 3 ) H ] pentazocine binding assay an oxa - PCU , NGP1 - 01 ( IC50 = 1 . 78 mu M ) and its phenethyl derivative ( IC50 = 1 . 54 mu M ) .
 Chemical: [ ( 3 ) H ] pentazocine; Chemical: oxa - PCU; Chemical: NGP1 - 01; Chemical: phenethyl
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: [ ( 3 ) H ] pentazocine; Chemical: oxa - PCU; Chemical: NGP1 - 01; Chemical: phenethyl