Met-enkephalin (also known as metenkefalin or opioid growth factor) is a naturally occurring endogenous opioid peptide with a relatively short duration of action. It is one of the two forms of enkephalin and serves as a primary endogenous ligand for the δ-opioid receptor, exhibiting high potency and selectivity for this site.
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
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Leucine enkephalin
pharmaceutical raw material
Nomegestrol acetate
pharmaceutical raw material
Tert-Buthyl Pitavastatin
pharmaceutical raw material
Lanthanum carbonate
pharmaceutical raw material
Cyclopentolate hydrochloride
pharmaceutical raw material
DADLE
research compound
L-Aspartic acid, L-tyrosyl-D-alanylglycyl-L-phenylalanyl-L-leucyl-
research compound
L-Tyrosine, L-lysyl-L-lysyl-L-lysyl-L-leucyl-L-arginyl-L-arginyl-L-glutaminyl-L-|A-glutamyl-L-alanyl-L-phenylalanyl-L-|A-aspartyl-L-alanyl-
research compound
The international HS code for MET-enkephalin (CAS 58569-55-4) is 2930.90.
2930.90
2930 90 95
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
(2S)-2-[[(2S)-2-[[2-[[2-[[(2S)-2-amino-3-(4-hydroxyphenyl)propanoyl]amino]acetyl]amino]acetyl]amino]-3-phenylpropanoyl]amino]-4-methylsulfanylbutanoic acid
YFGBQHOOROIVKG-FKBYEOEOSA-N
CSCC[C@@H](C(=O)O)NC(=O)[C@H](CC1=CC=CC=C1)NC(=O)CNC(=O)CNC(=O)[C@H](CC2=CC=C(C=C2)O)N
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