[{"from": "human", "value": "Could you give me a brief overview of this molecule? [C][S][C][C][C][Branch1][=Branch1][C][=Branch1][C][=O][O][N][C][=Branch1][C][=O][C][Branch1][#Branch2][C][C][=C][C][=C][C][=C][Ring1][=Branch1][N][C][=Branch1][C][=O][C][N][C][=Branch1][C][=O][C][N][C][=Branch1][C][=O][C][Branch1][=N][C][C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][O][N]"}, {"from": "gpt", "value": "The molecule is a pentapeptide comprising L-tyrosine, glycine, glycine, L-phenylalanine and L-methionine residues joined in sequence by peptide linkages. It is an endogenous opioid peptide with antitumor, analgesic, and immune-boosting properties. It has a role as an antineoplastic agent, an analgesic, a delta-opioid receptor agonist, a human metabolite and a mu-opioid receptor agonist. It is functionally related to a glycine, a L-tyrosine, a L-phenylalanine and a L-methionine. It is a tautomer of a Met-enkephalin zwitterion."}]