25333
Infusion of the alpha 6 - selective antagonist alpha - conotoxin MII ( alpha - ctx MII ) produced a robust , but transient decrease in phasic DA , whereas infusion of selective doses of either the alpha 4 beta 2 - selective antagonist , dihydro - beta - erythroidine , or the alpha 7 antagonist , methyllycaconitine , had no effect .
 Chemical: dihydro - beta - erythroidine; Chemical: methyllycaconitine
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: dihydro - beta - erythroidine; Chemical: methyllycaconitine