8943
In ~ 50 % of the visits , stimulant drugs like cocaine and amphetamine - like substances ( e . g . 3 , 4 - methylenedioxymethamphetamine ( MDMA , the main active ingredient of ecstasy ) ) are involved , whereas in ~ 60 % multiple drugs are involved .
 Chemical: cocaine; Chemical: amphetamine; Chemical: 3 , 4 - methylenedioxymethamphetamine; Chemical: MDMA; Chemical: ecstasy
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: cocaine; Chemical: amphetamine; Chemical: 3 , 4 - methylenedioxymethamphetamine; Chemical: MDMA; Chemical: ecstasy