18558
The design , synthesis , biological evaluation , and in vivo studies of difluoromethyl ketones as GABAB agonists that are not structurally analogous to known GABAB agonists , such as baclofen or 3 - aminopropyl phosphinic acid , are presented .
 Chemical: difluoromethyl ketones; Chemical: baclofen; Chemical: 3 - aminopropyl phosphinic acid
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: difluoromethyl ketones; Chemical: baclofen; Chemical: 3 - aminopropyl phosphinic acid