1723
To begin addressing this need , we characterized UMB24 ( 1 - ( 2 - phenethyl ) - 4 - ( 2 - pyridyl ) - piperazine ) and ( + / - ) - SM 21 ( 3alpha - tropanyl - 2 - ( 4 - chorophenoxy ) butyrate ) in receptor binding and behavioral studies .
 Chemical: UMB24; Chemical: 1 - ( 2 - phenethyl ) - 4 - ( 2 - pyridyl ) - piperazine; Chemical: SM 21; Chemical: 3alpha - tropanyl - 2 - ( 4 - chorophenoxy ) butyrate
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: UMB24; Chemical: 1 - ( 2 - phenethyl ) - 4 - ( 2 - pyridyl ) - piperazine; Chemical: SM 21; Chemical: 3alpha - tropanyl - 2 - ( 4 - chorophenoxy ) butyrate