3796
Using this assay , we reveal that the delta - opioid receptor agonist ADL5859 , which is currently in clinical trials , has a 10 - fold higher potency against delta - opioid receptor homomers than delta / mu - opioid receptor heteromers ( pEC ( 50 ) = 6 . 7 +/- 0 . 1 versus 5 . 8 +/- 0 . 2 ) .
 Chemical: ADL5859
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: ADL5859