18859
Impact of acamprosate on behavior and brain - derived neurotrophic factor : an open - label study in youth with fragile X syndrome .
 Chemical: acamprosate
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: acamprosate 
Answer:
 Chemical: acamprosate