21564
Nicotine , varenicline , and cytisine were administered alone , in combination with each other , and in combination with mecamylamine and dihydro - beta - erythroidine ( DH beta E ) .
 Chemical: Nicotine; Chemical: varenicline; Chemical: cytisine; Chemical: mecamylamine; Chemical: dihydro - beta - erythroidine; Chemical: DH beta E
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: Nicotine; Chemical: varenicline; Chemical: cytisine; Chemical: mecamylamine; Chemical: dihydro - beta - erythroidine; Chemical: DH beta E