Stars indicate closer matches.

Difelikefalin 
Adrenorphin 
Frakefamide 
Opiorphin
Big dynorphin
Dynorphin
Dynorphin A
Dynorphin B
Hemorphin-4
Leumorphin
Casokefamide
Amidorphin
Deltorphin
Endorphins
Metkefamide
Morphiceptin
Asimadoline
Eluxadoline
Fedotozine
Herkinorin
ICI-204,448
Norbuprenorphine
Norbuprenorphine-3-glucuronide
Alazocine
Butorphanol
Diacetylnalorphine
Dinalbuphine sebacate
Etorphine
Levallorphan
Menthol
Nalbuphine
Oxilorphan
Pethidine
Xorphanol
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