1484
The aim of the study was to investigate the effects of moderate and heavy MDMA use on cognitive function , as well as the effects of long - term abstention from MDMA , in subjects genotyped for 5 - HTTLPR .
 Chemical: MDMA; Chemical: MDMA
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: MDMA; Chemical: MDMA