1486
Fifteen moderate MDMA users ( < 55 lifetime tablets ) , 22 heavy MDMA + users ( > 55 lifetime tablets ) , 16 ex - MDMA + users ( last tablet > 1 year ago ) and 13 controls were compared on a battery of neuropsychological tests .
 Chemical: MDMA; 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; Chemical: MDMA