14613
Subjects received intravenous plus oral ( deuterium - labeled ) racemic methadone before and after ticlopidine .
 Chemical: deuterium; Chemical: racemic methadone; Chemical: ticlopidine
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: deuterium; Chemical: racemic methadone; Chemical: ticlopidine