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Stable, synthetic analog of methionine enkephalin (enkephalin, methionine). Actions are similar to those of methionine enkephalin. Its effects can be reversed by narcotic antagonists such as naloxone.
Chemical name: L-Phenylalaninamide, L-tyrosyl-D-alanylglycyl-N-(1-(hydroxymethyl)-3-(methylsulfinyl)propyl)-Nalpha-methyl-, (1S)-