Stars indicate closer matches.

DPDPE 
Hemorphin-4 
BW373U86 
C-8813 
DPI-3290 
Isomethadone 
Levorphanol 
DAMGO
Leu-enkephalin
Met-enkephalin
Cyclorphan
DPI-221
DPI-287
Samidorphan
Cebranopadol
Desmethylclozapine
Etorphine
Levomethorphan
Mitragynine
Norbuprenorphine
N-Phenethyl-14-ethoxymetopon
RWJ-394674
Adrenorphin
Dermorphin
Endomorphin
Β-Endorphin
TRIMU 5
3,4-MDO-U-47700
Acetoxyketobemidone
Acetoxymethylketobemidone
Acetylfentanyl
Acetylmethadol
Acrylfentanyl
AD-1211
AH-7921
Alfentanil
Alimadol
3-Allylfentanyl
Allylnorpethidine
Allylprodine
Alphacetylmethadol
Alphamethadol
Anileridine
AP-238
Azaprocin
BDPC
Benzethidine
Benzodioxolefentanyl
Benzoylfentanyl
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