14806
Sucrose recognition thresholds and measurements of pleasantness and intensity were determined before and four hours after 1 ) a single dose of methadone or buprenorphine or 2 ) naltrexone .
 Chemical: Sucrose; Chemical: methadone; Chemical: buprenorphine; Chemical: naltrexone
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: Sucrose; Chemical: methadone; Chemical: buprenorphine; Chemical: naltrexone